@-greyhearts
I'm really sorry... That's awful! I would try to get some space for a few days and try to get my mind off the crush. Try to find someone else to think about. Also, maybe have a chat with her and explain how much that hurt you. If she still is a bit mean, don't bother.
I've never been in a situarion like that, but I think that first, you should try with reason. If that doesn't work, put both of them aside.
I hope that this helps!