I came up with these as if a boy were breaking up with a girl because of what creature she is. It's pretty cool to imagine what they would say back to the boy.
"I guess you'll just always remember me as the vampiress with the taste of night, the look of blood in her eyes, and the body of a shadow."
"I'm just a werewolf huntress lookng for a mate, trying to make a living as a damn cross born!"
"Oh please, demons have feelings as well. You think we are so heartless, so cruel, so unpassionate that you forget those are words speaking from your mouth!"
"*wicked laugh* You're breaking up with me? *laughs again* We'll see who'll break tonight. And yes, I am a witch, thanks for reminding me! *disappears in smoke*"
"And no I won't just suddenly put you on fire! But since we're breaking up, you'll always suspect me as my dragon form flying above your house. You never know when though, will you?"