Why he avoids eye contact with me?

I use to have a crush on this guy but his behavior made me doubt a little.

Usually when we talk he avoids looking at me, usually he would be cautious with his words and distant in our conversations. Sometimes he would smile while talking to me and look at me but then look down/away really fast. I've noticed that he talks and jokes around with other people, and he has no problem making eye contact act with them.

What is up with this guy? Guys do you ever deliberately try to avoid eye-contact with some girls? And if so what are the common reasons why a guy would try hard to avoid eye-contact with a girl?
He don't like you
He likes you
He talks to you out of respect.
He don't care, he don't see you as a friend/woman.
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Why he avoids eye contact with me?
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