Why would this be happening to me for please help me?

Maybe he likes you....or maybe he's a stalker. If you can, ask him why he does it, or ask him to stop if he's truly bothering you. Or you could tell a teacher that someone is bothering you. They would definitely do something about that at my school, but I don't know about yours....I hope you at least find out why he does it, though. Good luck. :P