How to get over him?

Ok, so there is this guy I really like. He sometimes acts like he likes me and sometimes just as a friend and sometimes he doesn’t like me at all. We kind of are friends. But I really need to get over him because I thoght he was going to ask me out and he never did. I waited for him to ask me out for 3 months. I am tired of waiting. I also was wondering if he likes me. Now I m tired of wondering. Because of that I got so pissed and I wasn’t really my self these days. So I lost my bff and all that. I even hurt a guy who likes me. I told him to leave me alone because I was pissed. Anyway, I really need to get over this guy. But I just can’t do it. I tried not to talk to him, look at him, and be nice to him but I really couldn’t do them. I REALlY like this guy. He is sssooo hottt, funny, cool, seems mean outside but really nice in the inside, and fun to be with. HE IS SO AWSOME. Because of him I also have been getting bad grades. He has got me going crazy. WHAT DO I DO NOW?