I like him, but he has been giving me mixed signs. What should I do?

Anonymous
I've been in love with this guy for years, we're classmates. He gives signs to like me back, but other times he show signs that he doesn't. For example, when I was upset with him he (who's the argumentative type) gave up trying to justify himself and simply say he was sorry right away. He teases me a lot and does childish things to grab my attention, he asks me the oddest stuff, he doesn't deny or hesitates denying when his friends say he likes me, etc. But, he doesn't approach me if I don't approach him first, he doesn't say hi or bye to me, he never compliments me or the things I do even when I do it to him, if I'm not actively making an effort to talk to him he acts as if I don't exist. I feel foolish and don't know what to do.
I like him, but he has been giving me mixed signs. What should I do?
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