Thanks for the responses. I read Sally Conway's You and Your Husband's Midlife Crisis last year. I still have it somewhere.
I find it hard to believe my H is dealing with his issues at all. I think he just got a new life and is living it and never, ever thinks about his old life and never looks inside himself.
I have read a bunch of times how the MLCer doesn't look back until they experience loss. H hasn't lost anything and it doesn't look like he will. Maybe it's just a case of the grass really was greener.