Most Helpful Guy
"Ok, if you have a girlfriend... raise your hand... eh put your damned hand down, (now *ex*boyfriends name)!!! "
Or just say:
Ya... this ain't working, I;m sorry.
Most Helpful Girl
Don't worry - just be as honest as possible. Tell him you don't want a relationship but you also don't want to lose him as a friend, and that you understand if he's upset but you really hope he understands that you don't want to end up getting hurt. Good luck :)