YR, Give him as much space as you can. Does he has a special place in your home that he would consider his "man cave"? If he does, do not be surprised that this is where he will be when he is "thinking".
While he is "thinking", do something extra special for yourself.
It's not you...he's the one still healing.
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.
