Why is he always trying to annoy me?

Him and I are somewhat friends. We have known each other since the 7th grade (were both 15 now) and we have 2 classes together. But in BOTH we're assigned to sit next to each other (coincidence, huh?) anyways, ever since we started our sophomore year, he has been So annoying! He's always stealing my pencil, pushing my papers off my desk on purpose, trying to hack my pass code on my iphone but then disabling it, making fun of me and calling me names because I had an allergic reaction to something I ate, and just generally being annoying. Back in 8th grade, I heard a rumor that he liked me, but that can't be true… That was two years ago. What's going on, does he still like me or something? Or is he just a jerk?

Boys have a weird way of expressing their feelings. I'm almost a 100% sure he likes you.

I think he likes you. Guys have a weird way of showing it and we translate it as dislike, but it isn't. So, just laugh at him. If he thinks you like him, he may lose interest in you. It's an ego thing with them I guess? And if you don't like him as a future prospective boyfriend, the best way to rid yourself of him, is to pretend to be interested. The novelty of you will go away because the thrill wears off.