Why would he mention he has a girlfriend?

Anonymous
so this guy and I have been really shy around each other. we very recently been able to have small talks. one day we had a really great conversation for almost an hour. he glances at me all the time and always walks out of class with me, even if we don't talk. he fb messaged me something simple and we talked for a little there, but he started giving me awkward short answers. I thought he got bored or something.

but today he actually approached me himself (I'm always the one to initiate conversations). he asked how I was and we talk and talk (walking so close we bump arms, sitting so close we brush) but then I ask him if he's explored the city (he's not from my town) and he says yeah, he knows areas well. then he drops the bomb and says 'my girlfriend lives in that area'. he's single on fb, has no pics with her, etc. plus he's always so shy around me and I see him talking normally with other people. plus all the staring ... and he goes home after class every day and said he just goes to bars when his friends come up...again, no girlfriend being mentioned.

he could have a girlfriend because fb isn't everything, but why would he just sorta blurt it out? by the way, he wore sunglasses the entire time and I thought it was strange especially since we were underground... would a guy lie about something like that? does he not like me? I'm sorta confused.
Why would he mention he has a girlfriend?
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