How do I figure out if a guy with a girlfriend likes me?

I went to Homecoming with a guy who I didn't know too well, and I spent half of the time with my date, a quarter of the time with my friends, and the other quarter of the time with a close mutual friend on whom I've had a crush on. After dancing with him, I just couldn't dance with my date again. It just felt so right in my friend's arms, and not right in my date's arms. (And yes, I'm a horrible person, I'm aware)... And we danced the last dance of the night together- a slow dance, and it felt so good... He even pulled me closer to him. He seems to be sending out vibes, and I want to know if I stand a chance to go out with him. How do I tell him I like him and find out whether or not he likes me without ruining our friendship? My friend suggested kissing him on the cheek (but it would probably freak him out, no?), asking him ';for a friend';, ';accidentally letting drop that my friend thinks he likes me (which she does), etc.

So what should I do? I really want to know... Please help me~!!How do I figure out if a guy with a girlfriend likes me?
ask him!!!!How do I figure out if a guy with a girlfriend likes me?
call him on phone right away and tell him that u like him can this relationship work. if yes then u would like to meet him.
I would get my friend to see if he is into me and then act like you didn't know she was doing if he says no, but if he says yes...
maybe you shouldn't do anthing...just let the current relationship he is in run its course.
was he drunk and why do you want someone elses man?get your own man
Ask him if he likes you
kids...good grief. ask him how the girlfriend is doing and let him know that you are interested in him...if she screws up and he wants to make a change.
if u think its right go 4 a date