He smiles at me sometimes, he has a girlfriend. I like him, but he doesn't talk to me much at all? WHY? I really like him.

He might but if he has a girlfriend he may want to keep his distance out of respect for her. You really need a guys opinion thought because I cannot figure guys out for the life of me lol. The guy I like and thought liked me back recently got a girlfriend but he still stares at me so I'm totally clueless lol.

if he has a girlfriend and doesn't talk to u, sorry but I doubt he likes you romantically. since you like him, you may be interpreting things like him smiling as signs that he likes u. I hate to say it but that's what it sounds like. unless its very deliberate flirtatious smiles, in which case he's probably just having fun doing a little bit of "flirting" even though he likes his girlfriend.

Because he has a girlfriend, and he's a decent guy who realizes that it woudlnt be appropriate to flirt with other girls behind her back.

If you had a bf, would you be asking why he won't flirt with other girls who like him? Of course not, and youd think he was a jerk if he did.