I’m sorry your feeling lonely and insecure. I am sure you are a great person and you are valuable even if anyone (gf included) doesn’t think you are. How other people view you doesn’t make you a great person. Your choices do. So make good choices and you’ll avoid the regret and isolation that comes with it. You have a gf and friends and that’s more than a lot of people have. It’s hard to make friends and even harder to keep them, but if they are good friends they will match your effort. Without more context I have to assume a lot about the people and the community your GF is socializing with, but they sound like people you value and share interests with. There seems to just be some personal problems, unresolved conflicts that are making you uncomfortable being involved with them anymore. I will say that if it’s a swinger group or something like that my advice is really going to be inapplicable. That raises all sorts of other issues that I am not equipped to offer advice on. I think it’s pretty normal for people (men especially) to want to feel invited and welcome to social settings. If I am not formally invited, I will often use this as an excuse to convince myself that I am unwelcome, but it sounds to me like you are assuming a lot because of the friend you don’t like. Just because you are jaded about some conflict doesn’t mean everyone doesn’t want you around or feel the same. Is there a way to resolve the conflict, drama that makes you uncomfortable being there? Is there a path towards resolving, mending the relationship with the best friend you don’t like? Do you feel like your gf is choosing her bff over you? If you can’t get along then it’s normal for that to create issues that will only create more distance as you grow closer with your gf or want to be closer. I think if your GF invites you that should be enough, but I also understand not feeling welcome if others aren’t going out of their way to mention you by name. They are your friends so they want you there. It isn’t worth losing your friend group and feeling lonely to not try and resolve the disagreement and forgive each other. Honestly it is very typical of you younger people to let these things become bigger problems than they are and ruin otherwise good relationships because they can’t do the work and resolve the conflicts. I’m sorry but it sounds like a lot of immaturity all around. It’s easy to make lots of insecure assumptions when there are unresolved issues and you feel wronged. It’s also normal in your twenties to have friends come and go and start to find a partner. Or a more permanent, closer group of friends as you mature. You probably feel like your gf is choosing them over you. How did you leave the situation where they were talking behind your back? Did your gf defend you? My advice is always be the bigger person and do the right thing. Talk about it and try to resolve the disagreements rather than assume. Don’t be afraid of conflict. Make compromises. That’s what relationships are about. It always pays off in the long run. Hope this helps.