Why he avoids looking at me?

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

Isually when we talk he avoids looking at me, usually he would be cautious/ direct and distant in our conversations. 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?
Why he avoids looking at me?
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