Found out my crush talks about me behind my back?

pammm
I posted a message earlier stating that my crush is confusing and I just can't make out why he was acting all nice and mean at the same time. I found out yesterday, that my crush was back talking about me and spreading lies to people. That really hurt. I helped him pass science and spent all my time helping him when he needed it and stuff and in turn, he back talks. I unfriended him off of Facebook but unfortunately, I have class with him next semester. He's going to try to talk and get help from me during that time - he did that in every class we had together last year. I really don't want him to talk to me anymore cause I can't trust him and stuff and I don't think he deserves the help anyways. I knew so much about him and as did he about me. I thought we were really good friends, guess not. I don't know how to avoid him though as we have the same classes every single day. If he asks me for help, I don't know what to say, over all that, he still thinks I like him. I don't know what to do. I'm getting over him, but awfully slow. Usually I get over people fast but I guess it's cause we got so close at one point, I can't let go. How do I speed up the "Getting over your crush" process?
Found out my crush talks about me behind my back?
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