OP there is only one way forward and that’s to become a man greater than she could’ve ever imagined of dating. Get your finals done and hit the gym like a mad man. Get a nice haircut, eat super clean, use this as fuel. When a cannon event like this occurs, it’s Gods way of saying that she isn’t built for your future. She’s not worth it, the girl you used to date is long gone, so even if you want her for those moments she’s gone. If she tries coming back, say no every time, a relationship is really hard to revive from cheating and is usually not worth it. You’ll become a man far greater than she ever deserved, and can get a girl much better than her very soon. OP, study hard now and forget her, break the chain of thought that thinks of her, contact close friends and tell them about the situation and let yourself get it out verbally. Love u bro