My guess is part of the reason he started opening up to you more is that he relieved some of the pressure he has internally by making his big announcement.
This is day by day stuff. I know my worries and fears increase when I think about the what ifs and the future, but when I concentrate on each day as it comes I do so much better. Just try to get through today as best you can.
I agree with your tactic - let him take care of all of the details, the packing, etc. This is his decision not yours. Don't make it any easier on him.
