hrm, I'm sorry his disposition changed in a matter of an hour or so, but I think you are right about one thing...he most likely was that way because he didn't have a clue where you went.
As for the memory, depression does that to them. Their minds are racing all of the time and whatever goes in, doesn't necessarily stay there for very long. Whatever happened pre-crisis is stored in there and the memories are brought out periodically to remind us of what we did wrong, but the memories that were made during crisis, tend to get misplaced until we jog their memories at some point. Some don't remember much of what they said or did during the crisis once they come out the other side.
I hope today is a better day for you. Friday is just around the corner!
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
