Please help me, I am so confused.?

I have been with the same girl for about 9 months now. She is a great girl but we have a really difficult situation. We were introduced by a girl we were both friends with. This girl and the girl's boyfriend were very good friends with my GF along with another girl (Ruby) . Originally I got along decently with the friends but the boyfriend and girlfriend in the group were very controlling and we ended up getting into a huge argument, the whole group other than my girlfriend ended up hating me. I made up with them for the sake of my girlfriend but right after that I found out they were talking trash about my girl and myself behind our backs. I even found out that they were trying to set my girlfriend up with another guy WHILE I was with her. I told her everything I knew and she defended me and spoke to them but they guilt her and basically she kept switching sides and finally ended up dumping me because of the whole thing. We got back together in which point I started to bond with Ruby (as a friend and nothing more). The group excluding my GF ousted Ruby and even tried to get my GF to do the same. Finally after enough drama my girlfriend decided not to talk to them anymore and neither of us talked to any of the ppl in the group other than Ruby. Recently my girlfriend decided to "talk" to them casually but not to let it go back to how it was before, being best friends with them and all the hanging out. Since then the boyfriend of the girl told Ruby that he cant talk to her anymore because his GF doesn't like her and all these other things when Ruby did nothing wrong to them. My girlfriend is in a habit of going on all day outings with the group (excluding Ruby obviously) including the guy they tried to get her to basically dump me for. Her next 2 weekends are devoted to their parties and I feel sick to my stomach and so hurt that she even started talking to them to begin with after all the things that they have put us through. Ruby agrees with me but wont complain to my GF because she doesn't feel like it is her position to comment. I have told my GF how I feel but she doesn't seem to understand and is really attached to them. I feel bad and I don't necessarily want her to stop talking to them completely but I am really hurt about her basically pretending nothing ever happened. I feel really hurt that she is hanging out with them and whenever I tell her it only causes conflict. My GF is an amazing girl and I love her but I don't know what to do. Are my feelings wrong or stupid? Is she wrong for doing what she is doing? What should I do? Im so confused. Sorry about the length of this question but I will make it worth whoever wins Best Answer.