<human>: Can you give me a shortened version of the text?

So, I really liked this girl(we are both 18) for a year now (we are classmates, now in our senior year), and last month she told me she had feelings for me too.

We started dating, going out and kissing and all seemed great untill we went to a bar with some friends and she started making out with some random dude she found there, and she spent whole night with him.

I tried to end whatever we had together, but she told me next day that she was really sorry and that she was drunk, so I forgave her.

Fast forward till this week, i know she is still constantly talking with that guy, and even seeing him (I'm not supposed to know this). Even more, she started spending more time with her ex, who is still in her group of friends.

I know that my chances are probably gone, and I'm trying to get over her, but the thing is we still have 2 months of classes together and I can't just ignore her, she's a very sensitive person and she always complained to me that she doesn't have close friends around her.

Also, I have an extremely important exam to take in 2 months, and I just can't focus on studying because I always think about her and what she is doing, I even check her FB and her friends' FB every hour or so.
<bot>: So, the tricky question is, how do I get over her without completely breaking her and without looking like an asshole?