I have gotten absolutely lovely letters and texts...
I came to see it was all to keep the status quo or to get something he wanted...
My reaction to his letter: What a crock. "Here honey, look at what I wrote, I'm sorry, kissy kissy, BUT let me remind you of where you are wrong-you are filled with a smoldering sub-current of rage. I want a clean slate, sex and blah blah blah...."
I am sure he spent a ton of time on this letter to achieve the desired result: getting what he wants.
Don't buy into it...
JMHO