I am not at all surprised at him stalking off. This is a man who has been surrounded by 'yes people' and who has basically been unchallenged for decades. And when he has failed in the past he's been able to blame others or walk away saying 'Meh, I don't care' and left others to sort out his messes. I'm sure it's been a rude wakeup call for him, these last couple of weeks, not hearing 'three bags full, sir' from Congress and the press. And being asked why he isn't sorting his own shit out. I'm not sure he can handle it.
All we can hope is that he gets a real bug up his arse and resigns saying "You don't appreciate my greatness? Fine! I'll show you! I'll quit and you'll just SEE you can't live without me! You'll be begging me to come back!!!".
I know. Never happen. But a girl can wish, can't she?