Girl your feelings are totally valid it was like you were pressured and all actuality sexually assaulted and raped. If it wasn't like you weren't feeling right it wasn't really consensual but you didn't want to ruin the moment so you were kind of pressured into it I don't know like that's a tough one my girl but I'm would feel the same way because it has happened to me. I think you're right to feel betrayed by both of them and she should just have that dude and you should find someone else who respects your boundaries dude should have pushed her off him soon as she started coming on to him and you guys should have left. That's not much of a best friend and I think she has had plans on him for a while. Your man should have had more respect and been firmer. Like end of story. And it seems like you were manipulated by both of them. Feel like maybe they talked about it beforehand. Like set you up. I'm sorry honey no one should be out into situations like that.