Regarding the "YOUR" cupboard thing.....Try not to let his anger or frustration get to you. He may sound pissy (HIS problem entirely), but try to remember that he at least asked if it was ok that he get what he needed to get from the cupboards. IOW, look at it as him respecting your space.
He already knows he isn't living there. He doesn't need to be reminded either.
(((CW)))
Getting over a painful experience is much like crossing monkey bars. You have to let go at some point in order to move forward. ~ Joseph Campbell