Lots of people still trying to figure it out. Why now? Why him?
Maybe as the ultimate insider, he knew things that we don't that would make him leave, like:
Bush is dying of colon cancer, and Rove didn't wanna work for president Cheney.
Cheney is dying of heart failure, and Rove didn't wanna work for president Bush.
Laura switched from Xanax to meth and is making everybody's life in the White House a living hell.
Jeff Guckert is writing a book on how his affair with Rove got him in and out the White House without Secret Service logs showing it.
Barney the dog is writing a book on his affair with Rove.
...or maybe he just wants to spend more time with his family. His new family at DefJam Records?