daring, That was a beautiful text and I agree w/Matt...he should be taking you around the world on a wonderful trip, not a divorce. He doesn't feel that he deserves you and he knows that he may not have been supportive 100% of the time, etc., and right now, he's depressed and feels the need to get this message out there and he does realize that you are a great person and deserve better than him. In a way, it reminds me of a good bye letter.
Stand firm, do not fold as he is not the man you married. Make sure that whatever he agrees to is signed and dated. They will say and/or promise one thing today and tomorrow it's a different story.
Take care.
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.