Not being asked the Whacha's (Whatcha thinking about?; Whatcha Doing?; Whatcha watching?).
Bingo. I'm in a serious relationship and what I miss most about the single life is just the general freedom to do anything, not having any obligations to anyone. I could do anything and go anywhere and not have to check in with anybody. I miss hanging out with my friends, most of whom are single. I can't hang out with them as much because they do single guy things like hit up bars, clubs and parties.