Why does he think I don't like him?

This guy that likes me keeps posting on twitter that I don't care about him. The last thing he posted was "Missing someone I can't have". I really like him too though. I would stare at him sometimes, we would make eye contact a lot, I smiled at him most of time when he talked to me, I would always look him in the eye when we talked too, when I thought he was going to come and talk to me I would move around and like do something with hair if I thought it looked bad. All his friends that were girls kept telling him to talk to me and he did talk to me and it with me but not when they told him to.
Why does he think I don't like him?
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