I really like this guy that has a gf?

ok well me and my boyfriend broke up like a week ago and i dont rlly talk to him anymore cuz i like him alot still and i dont want him to no...so ya...and i like this other guy now and he is like rlly cute and like a month ago ,while he was still datin this other girl, and he said that me and him would go out sometime in the future and so i stopped talkin to him cuz i was still datin that other guy...so ya and now the guy i like is still going out wit tthat other girl and he found out that i like him and he is flirting wit me nonstop lol so wat would you do???