Day 10: A letter to the person you hate most or caused you a lot of pain

Honestly, I can't really pinpoint a person I hate...I don't really hate anybody, but I can say something to anybody who's ever caused me pain:

Dear you, 
Because of you, I'm much happier, much stronger, and learned a whole hell of a lot about what I want out of my life in future.  Though it sucked at the time, in the end, you're the idiot.  Thanks for proving that I don't need people like you to be happy.
-Gill