What should i do about him?

i had a thing with this guy dating way back and we had a thing for several months ...anyways we got in a fight over his cousin telling me he loved me ....it has been 8 months and now we started talking again i really like him he makes me feel special anyways i have kept it a secret from my friends for 2 weeks that i have a thing with him again i told one of them today and they said what he has a gf aparently they have been dating for a month ....i dont care to be his gf but i hate the girl hes with shes a skank ...anyways what would u do ??? play dumb pretend u dont know he has a gf or tell him you dont mind u just want him to be honest and u still want to have a friends with benifits thing with him