Dont know what to do

Well it's like this...i met this guy and i went to the movies with him..that same night he stayed the night at my house..we didnt go to sleep at all we stayed up all night until he had to leave in the morning. I really really think im fallin in love with him..but see hes got a girlfriend. He likes her a lot but he also likes me. i dont know if i should try and wait till hes single to actually sleep with him or if i should just do it even though he is with her..i know it sounds bad but i really like him a lot..we talk on the phone all the time! I would really appreciate some good advice.
post or email me
lisaj_04_88@yahoo.com

Yea thanks..thats what i know would be the best thing to do, and i have stopped seeing him and all that but i still think about him all the time and he calls me every night...but i guess i will wait till hes single.
Thanks