does he like me or not? confused?

i have like two questions like this but i hate them being long and i cant fit everything in but there is this boy i know and im bi-curious i think im bi not sure yet... but this boy is hot and im 17 he is like 2 or 3 years older? and i hve a girlfriend and he seems to flirt with me and he said in front of my girlfriend you know hes gay with me and everything? is he doing this to try and get me or is he just being a ****? we seem to always catch each others eyes and you can definitely feel something? i don't know if he is gay or not but he seems it a lot? so what do yous think i should do as well? Confront him or just play along to see how fa he goes with the whole thing?