OMG!!! DOES HE LIKE ME?

I've been in his cl for two years already. We're really good friends and I have a crush on him. He steals my stuff and writes his name all over it... all the time. He doesn't do this to anyone else. He punches me lightly on the shoulder to get my attention. For other people, he just calls their name. He teases me a lot in front of his friends, but with a smile so I know he's kidding. But when we are alone in the school corridor, he's suddenly very quiet and acts awkward... and he's the most outgoing guy I know. He laughs at all the things I say, even when they're not funny. He says he doesn't like anybody... what do you think?