Send a dozen dead roses with a note: "Roses are red, violets are blue, I'd rather be dead than continue seeing you!"

Forget bothering with actually dumping him/her, just sign up to the witness protection program and never speak to them again.

tell him: I'm not gay, but I'll learn.

say: All my friends at the gay bar said I should go through with the sex change, what do you think?

lol
Roses are red
Violets are blue
Trashed is dumped
And so are you

Pretend you have amnesia, if they keep trying to talk to you and jog your memory then just tell them you'll phone the police and have them arrested for harrasment, poor bastard won't have a chance.

Tell him he has turned you gay.

Just tell him about your sex-change your going to have

Tell him; TITS OR GTFO! :d

Tell him you have beastiality issues towards his pet.