Hmmm. Like the letter and I get it but will say I am not sure how he will take it. I can only relate this to my situation and husband. (Why does it always come back to me, me, me! Lol). I hope he will have a moment of clarity and man-up; however, that is not his track record. My husband has been unable to articulate or truly explore his feelings and what happened with out marriage. As a result, he just runs from any kind of confrontation or exploration of his feelings or demons. Your husband may, in his warped mind, think the reference to your marriage is you not giving up hope. Not because that is what you meant but how warped their thinking is.
So, I think you should prepare for not hearing anything from him, or for a surprise Absolute (ok, that is my paranoia). I hope I am totally wrong and not knowing him or how your communication has been or his state-of-mind, that he will agree with you.
Have you considered phoning him? That is when I have had the most productive conversations. I think my husband hears the detachment as I am friendly but businesslike but also show I am looking to work as a team to resolve this. Sometimes I think they are so afraid of our anger as they know we are justified in having such.
At least you got to get some of it out there and on paper and hopefully that makes you feel a little lighter. It's on the record that you are being the bigger more mature person and trying to move forward. Good on you.
Keep us posted.
Me-54 H-49 T-1. M-7 BD 6/13 ILYBN I threw him out OW - 3/13 OW2 on and off Overlap w/Ow1and OW3 OW3 - 8/17 H filed 1/17