I really like him...what do i do?

Ok...there is this boy that i met, and i thought he was cute, but i didn't ask for his phone number, so i neva talked 2 him again. Then, one day i found him on myspace, and he accepted me as a friend. We talked and he gave me his phone number. Then, i found out that he already has a girlfriend, but i really like him. So what do i do?