I really need some guy advice, I really just don't know what to do anymore!. Please help me! D:?

Now this is a long story but I'm really lost. So I met this guy about 2 yrs ago. And since the day I met him I knew we would be perfect together. So we started talking and we became really good friends. We knew and still know so much about each other. So we started "talking" after a few months. And it was amazing. We weren't official or anything but he treated me so well. We talked every day and night. And we could be on the phone for hours. We always had something to talk about. Then summer came and we still talked. We didn't see each other much but we still talked every day. And every day he would tell me how beautiful I was and how much he cared about me. So August came around and he started acting really weird. We still talked but not as much and all the compliments stopped. I had seen him checking out this other girl but I didn't want to think that was why. It turns out he has a thing for this girl. And he hooked up with her during summer when we were talking. I mean yes we weren't official but I still consider that cheating. I also found out a lot of stuff he told me were lies. So he dropped me and asked this other girl out. He broke my heart. And I swore I would never talk to him again. But of course that didn't last long. The whole time he was dating her he still texted me and flirted and it was so hard because I liked him so much and he was with someone else. So after a few months they broke up, which I knew would happen, but anyway, they broke up and not even a month after their break-up he tried making up with me. But I was involved with someone else at that point. Then he started getting mad jealous and would get angry at me because I was with other guys. Anyway he has been trying ever since their break up to get back with me. And as hard as it is to believe this is the short version of the story. But he lied to me and broke my heart too many times. But for some reason I still have feelings for him. I can't trust him though and I know if I ever get with him I'll end up getting hurt. I just don't know what to do or what to say to him.