My boyfriends friends

My boyfriend and I have been together for over a year, I liked his friends right away and bonded with them. As time went by I noticed their characters and in my opinion they are unreal with each other yet kiss each other asses. A couple of the girls loyalty to some people don’t make sense to me, such as such people who are poor at parenting or full of drama. I just decided to keep things cool and now I’m aware. Well recently, one of the guys girlfriend tends to black out ever time we see her and for whatever reason she starts getting touchy with h boyfriend and my boyfriend has told his friend what she does and she needs to stop and his friend justify his girlfriend cheating actions. One birthday party, she got drunk and started talking shit to me and brought up my boyfriend’s name when she was asked about marriage/kids question. I lost it. I almost threw a wine bottle at her. I made it clear she needs fo stay away from us and she burnt her bridges. The other girls say to my face they have my back and say they would react too but yet she still gets invited to things. My boyfriend and I today when she showed up to a gathering avoided her the entire time and just try to have a good time with everyone else. Once she left they were talking shit about her, but then tell me I need to let the drama go they aren’t gonna isolate people.

This is why I don’t care for groups and I prefer having friends one on one. I’ve tried keeping things cool with his friends so I never am that girlfriend that pulled him away but my boyfriend is seeing how much it hurts me how I don’t have any loyalty from them after all I do that they won’t do for each other. He’s getting to that point he would be ok about us not seeing them anymore. I’m happy he’s acknowledging my feelings but I feel awful at the same time that he wouldn’t see his buddies because the girls have to have drama. I don’t want drama myself but I don’t care to be around them anymore. What do I do?