Okay...wat would u do???

okay one of my really good friends WAS dating this guy and they broke up after 8 months! and i was always friends with him...and now since they broke up im startin to flirt with him and he is flirting back but ive been thinking that if he asks me out should i say yes? idk if my friend will get pissed at me...and dont no if i should take that chance..but i really like this kid....HELP!! wat should i do???