What if he's a perfectionist (a lot of people said that) and couldn't see us winning after these years. And just couldn't handle loosing (he himself said that, that it will be extremely hard to go back to winning with the current group because of motivation). Well that would be all on Conte then, specially when he himself signed a one year deal just month ago. Maybe he loves Juve, but loves himself and his rep even more?
I'm not blaming him now, and wouldn't want to in the future, but leaving like this is certainly a lot on him and he left us in a bad situation.