Sounds like typical behavior. He's having to face his own mortality and it is scaring the heck out of him. He can run, but he can't hide for aging and death.
Let him go. He'll be back when he has a better handle on his emotions. He's got a lot to think about in the days ahead. He's had a lot of triggers that set him off once again.
Keep the focus on yourself and think about what you want to do w/your life while he's trying to figure out how to find himself.
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.
