I don't know, if this was me I'd probably not try again.

She's cheated on you not once but twice, I think that tells you how committed she is to the relationship. You need someone who will treat you fairly and she's not and really not if she wants to remain friends with the guy (you're the wronged person here if she had problems with you not paying enough attention to her she should have said something). ALso you'll have to learn to trust her again and isn't all she's going to learn from this is she can run off and get it with someone else and then come back to safe old you and you'll always take her back.

She is taking advantage BIG TIME. I'm not saying it's the easiest route but I wouldn't even try to stay with her, you're young right (only at uni) there's plenty of time to find someone who will play fair with you.