You should just smile and hold his hand.
you say, " so hows it goin' between you and your girlfriend?" .
A girl LOVES it when a guy puts his arm around her and says 'I love you.'
It means he likes you.
put your arm that is close to him around him! Leave your other arm hanging, it might seem funny but it looks cute!
no
He's probably got a crush on you
I know that it is kind of gross but a girl puts her hand on the guy's waist or in his back pocket.
To be honest he probably just wants to sleep with you.
I think that maybe he thinks he's making you feel uncomfortable so he stops.
Then he has a thing for you girl.
If your a girl that's a good thing, if you're a boy then maybe not so good.
Well, it sounds like he likes you too, and that's his way of showing it. You've just shown him that his worst fear (you saying that you don't like him) was nothing to be afraid of. He's happy, and his enjoyment caused him to put his arm around you. It's nothing to get nervous over. Tip: Invite him to see a movie. If he says yes, and then puts his arm around you, you can safely assume that he likes you a lot.