A guy I like seems to look at me when I enter the hall or class but looks elsewhere I look at him and want to say hi, he's usually confident then why?

He definitely is confident from what I've heard of him and I know he definitely seems to avoid eye contact when I try to say hi after I locate him in the room or hallway... we don't talk much I don't know if I should talk to him or leave him alone..
A guy I like seems to look at me when I enter the hall or class but looks elsewhere I look at him and want to say hi, he's usually confident then why?
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