I think I would sit on that email for a while. After all, you did say you needed to think about it. Allow him to come to you and inquire and that's when you can give him your thoughts on the matter.
Just remember, that whatever happens, he could very well drag his feet on the proceedings, which means $$$ for the both of you. If he's being nice right now, that doesn't necessarily mean he'll be nice when he discovers what he is losing in a divorce proceeding. They all have their rose colored glasses on and think that we'll just roll over and play dead and allow them to come in and take 80% of the assets (or more). That we will continue to be friends and allow them to come and go as they please. Once they find out that life isn't that way, some of them become nasty little buggers and the ugly monster comes out to play. In other words, rock their boat and they aren't happy and will play dirty.
So, unless you are in a hurry to get the ugly deed done, I would sit back and watch the show for a bit, but that's just my opinion. Nothing says you have to respond in the next 72 hours or so.
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.
