When you’ve been going steady for a while and the relationship is still going strong, you might be tempted to think, “I can’t believe we’ve been together this long without doing anything wrong.” But as time goes on and you start seeing indications of cheating on your part, it may be time to take precautions.

The best way to know if your girlfriend is cheating on you is to ask her directly. Don’t wait until things start going sour before you ask. You can also use some handy tools to help if she tells you she is dating someone else. These are just a few ways of looking for cheating signs:

1) She seems to want more sex than you do
2) She seems too nice/nice guy friends
3) You see her in certain places where it wouldn’t surprise you if she had an affair with someone else
4) Her clothes were bought in store or online rather than at home
5) Her phone was used in places where it wouldn't surprise anyone that she was having an affair (as opposed to her regular phone which knows her whereabouts all the time)

1. Her Phone Is Always In Active Mode
We have all been there: you’re hanging out with your girlfriend and she suddenly seems to change her phone habits. While this can be very frustrating, it typically points to one of two things:
a) She's cheating on you in some way
b) She is having an affair with another guy.
Of course, the other option is that she just bought a new phone — but that would mean that she was cheating on you with someone else, too. It’s possible (and not impossible) that your girlfriend may be having an affair but have no idea about it. This is likely to happen if your girlfriend has her phone on silent while they are talking, or if she has her phone in either hands-free or vibrate mode while waiting for a call; this isn’t cheating though because the person doesn't know about the call and thus can't hear what you're saying anyway. It could also happen if your girlfriend starts talking about other people when you are trying to talk to her (she's probably keeping up the charade that she's just got a new phone). Whatever the reason for switching phones, let’s look at some of the signs here:

Sign #1: The Phone Is Always On And She Has No Response When You Call Her
Your girlfriend only takes calls when you do (and vice versa). You know how annoying it is when someone hands you their number then hangs up? Or when someone keeps calling back and no one ever answers their phone? It means they are ignoring your calls; something only happens during those times. Your girlfriend may simply not want to answer the phone because of a work emergency or something even more serious. In such cases, texting will solve this problem as well as texting while driving — but texting while driving may mean breaking much more traffic laws than texting your girlfriend (though there’s no guarantee). If either of these situations is happening and your girlfriend won’t answer calls or texts from anyone else, it might mean there's something wrong between them and they're cheating on you.

Sign #2: The Phone Is Always On But She Won't Answer The Text Messages You Send Her
A great many people initiate contact with their mobile devices by sending text messages first (which usually means initiating contact through Facebook Messenger or WhatsApp), then read their friend's messages or reply before responding back themselves. What does this mean? It means that someone else has already sent them something, so

2. Her Social Media Life Is Out Of Bounds
If you are in a relationship, you probably have one or more very important and annoying things to do every day. You might have to figure out what your girlfriend’s Facebook status is, whether she is cheating on you, whether she is unfaithful, etc. These are all things that are very important to do and that you would like to know about pretty quickly when you get back from work. But if you are like me, the first thing on your mind when coming home from work is “What the hell? Where’d all my time go?”
This is an area where our Intel stock does not shine (and it really should) — we can’t tell how much time went into her Facebook profile or her Twitter feed because we don’t know what they look like and how they affect our relationship with her. So…
We want a way of finding out what they look like so we can fix them.
First up…

1. Ask her if she wants to share something on Facebook or Twitter that has nothing to do with work (we will call this activity “the activity”). For example: “Okay, I need to know what my girlfriend did last night so I can figure out how much time I spent on Facebook last night and for how long (vs some other date).” We will use the following scenario as a guide: She says no; we ask again; she says yes; we ask again; and finally get an answer!

2. Let’s say that she said yes about 1/3 of the time; would that be good enough for us? In most cases yes — but this isn’t true for everyone! Remember, there isn’t a one-size-fits-all answer! So…

3. Let’s say that she said yes about half of the time — but then after talking with her in person/on Skype/on phone/etc., they start changing their behavior (again). So…

4. Let's say that after talking with her in person/on Skype/on phone/etc., they start changing their behavior (again). So…

5. We then want to see which activity has been focused primarily on Facebook over the past week vs the past month vs some other activity! That is, let's make a chart showing weekly hours spent on each activity:

3. She Is Aloof Towards You
The truth is that no one really knows what signs to look for in a cheater, which is why most of us are focusing on the red flags — the things that could be warning signs of infidelity. But there is a better way to look at cheating — because we can’t just assume that once your partner does something, it’s time to stop dating them:
The following are some signs your girlfriend/boyfriend might be cheating…

1. You feel like you don’t care about her or how she feels anymore
2. She tells you she will change but then doesn’t

3. She loves you one day but then treats you badly the next 4. She doesn’t trust you 5. You fall in love with someone else 6. You feel like your relationship isn’t as good as before 7. You feel like you can never get away from her 8. You start checking her phone every few hours 9. She makes plans with other people 10. She acts distant or uninterested 11. She doesn't seem interested in sex 12. Starts asking questions about other people 13. She has a new guy friend 14. Others notice changes 15. Things go too far too fast
4. She Erases Browser And Chat History
Cheating is an incredibly common problem, and yet, it is hard to tell when you are being cheated on. If you can’t tell, then you aren’t being cheated on.
One of the most reliable signs that your partner is cheating on you is that they are erasing browser and chat history. It’s very clear when you are being cheated on, because when someone does this for a long time (a few months to a year), it becomes clear that something is wrong. A friend of mine was dating a guy who did this for nearly 2 years completely without telling her (he would delete browser history in between calls, he never told her he was going to do it). When she asked him why he did it, all he said was “I think she's cheating on me”.
This isn’t just about some random web browsing behavior; it is about intentional behavior. A lot of people don’t realize that they are being intentionally erased while they are talking to their partner to make sure they aren’t going to try and figure out what they were doing before the call ended. One of my friends accidentally deleted the history right before text message ended. He had no idea he was doing this; in fact, he thought his partner had just been sending him text messages immediately after we hung up and wanted him to know how she felt about their conversation.
Funny enough, I found this out because my girlfriend was doing exactly what I was doing as well: erasing browser history between calls! Of course I didn’t realize at first that she was doing it too! I eventually figured out what we were doing through conversations like “Why did you do that? The last time we hung up before text message ended… You sent me a text message right when the call ended! You didn't even call me back the next day… What if I thought there'd been something wrong? Why wouldn't you? Why would you do this? Can we get back together? What if I wanted us back together more than anything else in the world? Why wouldn't you want us back together more than anything else in the world? Why would you want us back together more than anything else in the world? How could we be happy together again without each other… Does anyone actually care about us anymore… Are we so broken apart from each other or have we just decided not to be happy anymore… ? The

5. She Is No Longer The Initiator Of Your Sex Life
I’m not a relationship expert, but I do have some advice on the subject of cheating. A lot of people often ask me where they should look when their girlfriend is cheating on them. I’ve heard it said that signs of infidelity are subtle, but not nearly as subtle as an adulterous atmosphere. For example, you might notice that your girlfriend spends a lot less time with you than she used to. This could mean she’s enjoying life more and she doesn’t need to be constantly occupied; it could mean her boredom is finally being alleviated by her new interests (like watching Netflix or sleeping); or it could just be that she’s getting bored and you’re taking too much time away from her . . .
Let me be clear: it is not in your best interest to give up on your relationship because your girlfriend is cheating on you. But if you are concerned about infidelity, here are some things to watch for:
The number of days/times that your girlfriend has been spending with another person
If you and your partner have been together for a long time, this may not be a problem for long period of time. The longer relationships tend to get more stable over time and therefore the more days or times someone needs to spend with her partner in order to feel comfortable with the situation. She may seem like the same person when they aren’t together anymore – they might even seem hungry if they haven’t eaten in a while! – but there will likely be some change in how comfortable she feels if she has more free time than usual with someone else.
If your girlfriend isn’t dating anyone else right now, this shouldn’t come as too much of a surprise if it hasn’t changed much over the past few months or so (especially if there isn’t any significant other outside work/social life). If this does happen though, then what will likely happen is that things will start changing again pretty soon after she starts spending time with someone else. Because most people don’t stick around for very long periods of time once their sex lives start changing drastically (I realize this isn’t exactly true: many people leave relationships out of boredom or just plain apathy), it can take quite a while before things start getting back to normal (assuming it ever did). If there was no other reason why you would find yourself feeling insecure about

Final Word

This is a very common question. The answer to it varies from person to person. For some, it’s that cheating is an extremely serious problem and if you are naïve enough not to realize it, you can be hurt badly by it. After all, a cheating relationship is like a marriage — it needs to be kept secret until the last moment. Cheating will only hurt you more if you don’t do anything about it now!
Over the course of this discussion thread, there have been many people who have asked me “Where do I start?” and “How can I tell if my girlfriend is cheating on me?” Unfortunately, there aren’t a lot of answers out there right now. So we are going to share some things that have worked for us and maybe someone else can use to build their own road map.
First, let’s start with the basics: why do people cheat? And what makes them cheat in the first place? Is it just one or both partners wanting sex more often or longer? Or perhaps they say they want sex more often but really only want to fuck when they feel like it?
Second, how much does each partner know about their partner's behavior and how much are they willing to admit about the situation and what (if anything) each partner has done about it before now?
Third, how much does each partner trust each other enough for them to commit fully without fear of getting caught or just feeling like this was not their fault at all? Asking these questions will help you find out both what makes your girlfriend cheat (and vice versa), whether she has cheated in the past; whether she has had affairs before; whether she tells you about any affairs she may have had in her past; whether she ever cheated on her husband or boyfriend before; whether she ever cheated on her ex-husband/ex-boyfriend/boyfriend's ex-girlfriend/boyfriend's ex-girlfriend; and what (if anything) made her decide that now was finally time for her to get caught.