Liking someone in a relationship?

So I recently turned 21, a little over a month ago I noticed this cute bouncer at a bar I go to frequently. One night I was pretty drunk, so I gave him my number (just on a napkin, didn't actually talk to him) and he never contacted me. The next weekend I saw him again and asked if he had a girlfriend and he said yes. So I was pretty disappointed. But I've been there pretty much every weekend since and my friend catches him looking at me, he intentionally walks right in front of me, this past weekend I was walking past him and he was like "hey, how are you?" (I think cause nobody was around) but there was no reason for him to talk to me. And he smiles at me too and l'm not sure how to feel because I know he has a girlfriend but I can't shake the crush that I have. Last Saturday I was leaving and he was like "I'll see you next weekend".

I know that he is a Taurus, and him and his girlfriend have been together for a while.

Should I just move on, is there no hope?

(I'm a taurus also, and btw I would never try to ruin their relationship or want to be the other woman. Just want to know if there's any chance at all - maybe if they break up one day)

He's just making small talk to a customer, don't read into the 'hi, how are you'.

Don't wait around for someone whose in a relationship on a pray that it might turn sour. There are plenty of other hot guys out there.