You need to allow him to complete his crisis. If you don't, he'll continue to return to it until he's finished or will stay somewhat lost for the rest of his life.
Please just leave him be. You can't snap him out of it. It has to be completed in full for him to become a more mature man. Yes, some do tend to come out of it if there is another crisis that will wake them up, but I can assure you, that sometime down the road, they will revisit Wonderland and Peter Pan all over again.
If you date, you date for yourself and for the company, not to snap him awake. The things you do such as changes you make are for YOU, not him. It's best to focus on you and your family and allow the man upstairs to work on your h.
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.