Possessive guy friend, not joking??!!!?

I hadn't realized how much of a hold on me he had until he started to not come to school that much. Without him the first day, I felt lost and didn't know what to do. When I'm not there, he's depressed. Now, for the creepy parts. He doesn't let me talk to ANYONE else for too long. He literally pulls me to sit on him or near him all the time. He CONSTANTLY touches me & sometimes in places I don't want him to touch. Sometimes, if I don't do something he wants me to do, he hits me. When we have partner projects, I don't have a choice to go with him, even when I want somebody else. When the teacher pairs me someone else, or makes him move away or makes me move, he gets pissed off & starts cursing the teacher/student. I have more fun when he's not there because I feel free & I can do what I want. People see the difference. My sisters love him because they don't know him like I do, he even puts a front in front of my mother. He's been to my house 2 times & twice he hit me repeatedly, but then when I get mad at him, I feel bad, or he starts hugging me. I try to move, but he follows me everywhere. I'm kinda used to stalkerish behavior, but I've known him for 3 years & he just gets worse. He doesn't want to date me & I don't have any feelings that way for him, but he gets pissed when another guy starts flirting with me or if he hears I like another guy. I'm 14 and I feel so stupid helpless, he's not the only guy I let run over me, but the others don't hit me, they just make a LOT of sex jokes. Which is whole other day to explain, I'll probably have a question about that too...

Anyway, tell me what to do with him while trying to keep the friendship because he's been a part in my life for 3 years, but I'll be old enough for my mom to let me date soon & already 2 guys say they'll wait for me. I only like 1 back though. I need to get him to back off. He also finds it cute when I get mad & likes it when I try to hit him back.