Don't. Definitely don't. He's just trying to draw sympathy out from you with his pitiful, woe is me crap.
Give it several hours. If he sends something else equally pitiful, then the only appropriate response (other than silence) would be, "I'm sorry you feel that way."
Period.
Or even better -- "God, 'pathetic' is sooooo unattractive!"
Everyone's right, Ashlee -- DON'T ANSWER HIM. He's just being a whiny little baby, and trying to make this all about HIM.