Ugh. My mind is going a mile a minute, quite literally. This email sure has taken me through the range of emotions.
Right now I want to scream "AND WERE YOU COMMITTED TO ME AND OUR M WHEN YOU WERE DRINKING 6 NIGHTS A WEEK....OR HOW ABOUT WHEN I WENT INTO LABOR WITH S6 AND YOU WOULDN'T STOP DRINKING....IS THAT COMMITMENT???????"
Shame on me for not being sure whether I needed to accept that as part of the deal!!!
As hard as it is, try to slow down. You have been working on this relationship alone and have had a lot of issues with the relationship for a long time. I know it's taken a lot of time and soul searching to get to the point of being able to propose a separation and begin divorce proceedings for your own sake. Your H's e-mail doesn't negate all your work and doesn't mean that you have to rush back into his arms as things are right now.
However don't go to the other extreme and start minimizing his comments in the e-mail by pointing out all the ways he's wronged you in the past. His e-mail was meant the way your e-mail was. It was to put his thoughts out there and see how you react. There's a lot to react to but I think taking the items that are common for both of you and true for both of you would be the most effective start.
The hard part about responding to this e-mail is how passively it was written. The key is to not get pulled into that tone and yet not to dismiss how he feels. Good Luck
But what is happiness except the simple harmony between a man and the life he leads? ~Albert Camus