Not OP but in a relationship. I don't know if it's just the people that we know, but when I go out with my single girlfriends, our nights consist of lots of wine, lots of catching up, and the occasional guy who will try to hit on us but who we dismiss pretty quickly (and respectfully). The main focus on our evening is catching up with each other. If she wants to get picked up, there is literally every other night that month that she can go out and can entertain advances.

However, when my boyfriend and his single friends go out, he gets put in such compromising situations that I'm not comfortable with, that it's difficult for him to even enjoy himself when he goes out. He complains about it as well (and I'm not a jealous person at all). He complains that his friends get super trashed and are just constantly trying to hit on girls. He wants to chill with them and talk/catch up and if the occasional wingman duties come up, he's fine with it. But, he feels like he's constantly being left alone in the bar, that his friends don't really care to hang out with him and he's an afterthought, etc. In a similar note, it's like when a guy gets in a relationship and he forgets his friends, they get pissed at him. But for some reason when guys are trying to constantly pick up girls and constantly neglect their friends, somehow that's okay. He just wants to grab a beer and talk and chill every once in a while, not chase around a drunk guy around a club/bar. That's why a lot of times he won't even entertain the thought of going out with his friends. It's not because of me, but because of them.

Obviously this is very anecdotal but hopefully it sheds some light.