Guys, making intense frequent eye contact without smiling? what does that mean?

there is this guy i've been kind of staring at cause he's so hot, and everytime i do he looks at me too, we always lock eyes but he never smiles, he just has a plain face expression or he looks a bit suprised. i have also cought him staring at me when i wasn't even looking his way.

I mean most likely, does he like what he sees? or does he just think im a weirdo for looking at him all the time?
if he was smiling i would think that for sure he was into me but now i just don't know.. and also he is a bit shy.
Guys, making intense frequent eye contact without smiling? what does that mean?
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