"I agree, our marriage is done. The marriage we had suffered from [XYZ]. And I'm moving forward, setting a new course for the person I want to be and am working on it. I am glad to hear you feel you're becoming a better person. I want you to be happy."
Hiya, C.
I am dealing with some personal issues that require my time which is why I've not been here for some time. Whatever you do, DO NOT send the above suggested text/email response. Sit tight and I WILL be back tomorrow with a suggested response that is in line with DB principles.