Even without going through a divorce it's hard. Most of my friends over the years and I have mostly lost touch other than happy birthdays and the occasional 'hey what's going on? We should hang out some time when we're both not busy' But, understandably, people are tired or busy with things and it never really works out. My coworker's lives are all pretty different from mine. Either they're young, early 20's and I can't really relate to them and they're doing their thing or they're older and spend their time with their families. I've tried making friends online in different places, it sort of ends up being the same though, you talk for a while frequently, then you both get busy or whatever.