No matter how adamant you are about maintaining your current friendships, some of them will fizzle out. It's just a fact. For instance, you might stop going out or spending weekends away and instead spend more time with the moms from your neighborhood playgroup. As your kids get older, you might become friends with some parents on the PTA or the parents of your child's travel sports team. It is no one's fault. It's just how life works.