See, when you sit quietly, the answers will drop in your lap. From his email, he's having some moments of clarity. His guilt has been eating at him and yes, your going dim has made him realize that you could very well move on.
For this moment, he's baring his soul to you. However, tomorrow or the next day, he could clam up once again. He's realizing what he's lost, but he's not done the work of healing yet. He hasn't mentioned one word about seeing a professional to work on his issues. Notice he's mentioned that he doesn't want you to wait on him? He's still got a ways to go and this is mlc lingo.
If and when you are ready to respond back, you might want to say something like this: "H, thank you for your email. I appreciate the fact that you opened up and shared your thoughts with me. I'm sorry you are having to go through this and I do hope that you find a way to heal." Now, it's up to you if you want to meet with him to discuss the future, but I think I would wait on that until after Easter.
BTW, I got an email very similiar to this from my xh right after my bil was killed. We had been divorced approximately 3 1/2 years and he had gone on to marry twinkle twat. I responded w/the language that I posted above.
Hang in there. He's still got a long way to go. Stay the course and keep to your boundaries.
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.