Why is he doing this!? I will answer your question. *10points!*?

This is a sign of him liking you, of course. Boys are generally nice than mean, if they like a girl a lot. So he is trying to flirt with you, just play hard to get with him, maybe you and your friends could ask him and his friends to go bowling or something. Get to know each other. Even though, I haven't had a boyfriend, and I'm in 9th grade too (even though I'm suppose to be in 10th) I give relationship and dating advice to everyone of my friends, when they have problems with their crushes or boyfriends, trust me on this one, you won't regret it. ;)