Talking to him is a good start, of course.
If he doesn't act interested, then.. well, he's not interested. Guys are straightforward like that, most times.
Look at his body language. When he's with his girlfriend and you're around, does he tend to look at you and pay less attention to his girlfriend? Does he make attempts to talk to you even though you've never talked before? This happened to me, except this guy and I talked all the time. We were at a party for graduation, and he didn't cry when his girlfriend left, but he cried when I left.
Personally, I would be more creeped out. The new person should wait for a little bit before he tells that he likes her.
If you look him in the eye and smile and he smiles back then he likes you. But you might want to smile more than once so he's sure you like him and it's not just an accident or something.
Means he's not interested but doesn't have the balls to tell you himself.
he doesnt
Small talk. Tell her how you feel.
This would be considered a different type of "liking. She most likely would like you because she likes talking to you. Since she hasn't met you yet, you and her would not know if she likes actually being with you.
They don't and never will
He likes you.
you can tell if a girl likes you by she is wearing different hairstlyes that she has never worn before or she'll always look at you or wave hi when your looking at her. That's how ya know
You should get him on his own and tell him how you really feel, or you could get one of your/his best friends to ask him out on behalf of you. Hope this helps.
She either just doesn't want to tell you who she likes, (I'm a girl and I would never tell a guy who I like!) or she likes you! Hope I helped ;) x