Guys, why would a guy avoid eye contact/talking to me?

Curious011
There is a guy who seems to be always nervous.
(I don't know what's making him so nervous, but he often takes a deep breath, fidget, etc)
I met him only a few times, and he's completely avoiding to make an eye contact with me.
During the discussion, I would stare at him whenever he talks to the group, and look away in every each second, so I wouldn't look like a creep. But he never looks at me, or talk to me. (he would face to the other people in the group, and talk to them, but not me. He didn't make a single eye contact)
I want to know why. Do you think it's because he hates me?
Guys, why would a guy avoid eye contact/talking to me?
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