I've messed up...

Long story short, I really liked this guy (lets call him A) at about Easter time and in the end they then said they didn't want to make anything official because i'm at uni and a 2.5hr drive away. I left it and got over it but every time I saw them with the girlfriend they got (who funnily, was also about to go to uni) I got a bit upset and jealous. I got over it and then they cheated on their girlfriend and broke up with her. This was about a month-ish ago and because of that, i've 'got with them' (not sex) since then. Before anyone says, no they didn't cheat on their girlfriend with me. I would never do that and cheating on anyone is just horrible. But there's a problem. I really don't think ever doing anything with this 'A' again is a good idea because I just get hurt. I regret what happened with him because a while back, I really started to like this other guy (he can be 'C') and I kissed them quite a few times while I was out clubbing etc. I then found out later on that they didn't like me via someone else and then that's when it all happened with C. Someone else was also very silly and asked me if they were a better kisser than C and I 'had to answer their question' so I did - this was quite a long time ago and I never got any feelings for them whatsoever. I heard that someone (obviously) wasn't happy with my 'guy hopping' and oh god, I feel dreadful. It's the worst thing I think I have ever done and the biggest confusion I've ever gotten myself into. Because this person was annoyed do you think maybe I had an actual chance with C or not? Should I speak to anyone out of these guys about it? Should I just stop everything with A and C and take this as a life lesson? What would you do? Please no calling me anything, I already feel dreadful enough to post about it on here and I'm really ashamed of what i've done.

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