Well, I think it's obvious that whenever she goes out drinking with her friends, you're not going to be able to trust her. If you agree with that, then just break up now and avoid all the drama and upset. If you know that you can forgive her and be able to let it go and not go through jealousy and suspicion when she's with her friends then stay with her.
To stay and punish one another ad nauseam because you can't trust her is just a huge waste of your emotional health.
BTW: If you do stay you best make it clear that if anything remotely the same happens again (even if she drinks to excess and can't control her actions in any way [not just kissing other guys]) that you'll bounce because obviously drinking to excess is a problem in itself never mind that she claims to not be responsible for her own actions while drunk. "Accidently kissed a guy" pffft.
Last edited by Wakeup; 06-03-14 at 06:11 AM.
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion