Y'know...if I thought the idea of what Dad did to Dean, by...selling his life so that Dean could live and then watching the guilt, the anger my brother had....if I thought that was bad? Now I know he did it for me. He knew I'd be better off with Dean, knew I'd be happier. So...him dying? And Dean suffering?
It's all my fault.
Because I'm an asshole who can't get along with his father.