Guy's Behavior

Guys, Why would a guy frown at a girl when he sees her?

I posted this question before, but I decided to repost with more details

So I saw a few answers from other people questions and some say "they have a crush on you" others say "they don't like you" but I can't seem to find the most accurate reason I guess. I had this friend, we talked in the past. and now, for about two months we don't talk to each other anymore (well I didn't like his attitude) and now he still glances at me or just stares, when I look at him I find him looking at me. I even saw him searching for me with his eyes (he doesn't know any of my classmates or people I hang out with so... but recently he started talking with some of my classmates) and sometimes he turns away when we make eye contact and frowns while looking at the ground. I didn't do anything to upset him though, I mean I didn't offend him. I don't really like him, I am just curious what is up with that. Any honest opinions?

P. S. he always smiled when we were talking and stared right into my soul (haha just you know, right into my eyes) but that was when we knew each other
This never happened to me
This happened to me
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why would he even look at me if he dislikes me?
Guys, Why would a guy frown at a girl when he sees her?
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