You should wait it out if you start to notice your feelings for him become stronger or you dreams where he keeps on reappearing break up with your current bf and wait for your bf to get a gf before you ask this guy out
Sort out your feelings... Your going to get confused which is not what your aiming for. So, talk to that other guy and see what's going on... If it's not what you had expected then keep carrying on your current relationship. Good luck.
You need to follow your heart, cause you can't have it both ways!
Hold on to your feelings so you don't betray your guy.Otherwise you go up to the guy and tell him you got feelings for him.