Guy Friends Wow!!!?

i like this guy a lot but he doesn't like me we are just rlly good friends but how come i keep flurting with him?? just because i think he is really cute idk then i feel like i shouldn't call him because he is hanging out wih his gf because i mean if she new it was another girl then i would probaly break them up and he would be really mad but his gfs don't know its another girl so ya.