Hows this:
To: [insert dental school]
I just feel that we are growing apart. Maybe we weren't ment to be in the first place, but it sure has been a hell of a journey. I have to confess something though--I've found another school. We're just more compatible together, and we appreciate each other more. I know you'll turn out okay though, there's a lot of other candidates out there, and I'm sure you'll land on your feet and find the right one's for you. Thanks so much for understanding. No really, it means a lot. Well.....ummm....I guess I'll see ya around or somthing......Oh and try the Hot Pockets, they're breathtaking, they really are.