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Guys: Why would he purposefully try to antagonize me?

So there is a guy I met at the beginning of summer who goes to my school and works on campus. We both liked each other, I asked him out. He said yes and we talked for a couple of weeks. He likes to party a lot and I told him that partying isn't really my scene. He got mad at me (because I guess he thought I was rejecting him with what I said over text. He mistook what I said) and well things became awkward between us. We finally became friends again. After a while he would flirt with me and do other things that would indicate he was still interested. One day I was telling him about a movie my friends and I were going to. He wanted to see it so I invited him. He said to me "I don't date. If we went out I would tear you apart emotionally because I go out to the bars a lot and I don't want to do that to you. I only date older women now." Now after that he is purposefully trying to antagonize me. If I ignore him, he'll do things to get my attention. If he sees me he'll ask me " hey (my name) what's up?" Then walk away while I'm answering. When I'm talking to someone else he'll interrupt. He always finds a way to be right next to me. If he needs something near me, he'll even reach around me! I'll catch him staring at me and when I do he'll turn away quickly and pretend to be busy. He'll walk right up to me, but won't say anything, just stare me down. I don't get it, what is he trying to do? Unfortunately I can't avoid him, we have classes together. I've tried to just avoid him, but if I do run into him I'll say hi and go on my way. I've started to hang out with another guy ( just a friend), but not right in front of him. A mutual friend of ours ran into me when I was hanging with my guy friend. Do you think my guy friend is the reason this guy is acting so weird? This guy rejected me so I don't really see why he'd upset. I've tried to give him space, but he gets in mine.
Guys: Why would he purposefully try to antagonize me?
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