How come I feel that this guy who has a gf is attracted to me?

[Bryndis]

I don't show any interest back but he does odd things
Like sit directly across from me at an entirely empty table
Walks right in front of where I'm sitting whenever he sees me in the library
Just today he randomly facebook messages me about something
He didn't accept my Facebook friend request

Umm

My friend told him I found him attractive (he looks like an ex) and since then..this has happened.

He's someone I could never have as a bf (look at what he is doing lol or I'm just paranoid?

[Lauren]

I wouldn't worry about it too much, if you have no desire to be with him don't pay attention to it. Maybe he just likes the attention cause he thinks you're looking at him? Or maybe he does want you. But if you don't want him, just take it as a compliment and disregard it