Is it a turn off when you flirt with a guy that has a girlfreind? because hemay possiblylikeme?

ilike this boy and he has a girlfreind . i never really had a that many conversations ith him only because we havenet hungout that much. but ithink he may be attracted to me but last time i hungout with him he didnt talk tome atall prolybecause he just started goin out with thisgirl. so next time i see him i have to really do something more and talk to him more so thats why i was wondering this question