Barkley,

I don't post much, but I do resonate with your sitch and am following along. I understand how hard this is for you...my H is in a similar predicament, in that he has trouble facing the pain he has put me through in our marriage. I know it hurts really badly right now, but Coach is right--you have been given a gift. Embrace it as such. Others may offer other opinions, but I kind of like your letter. Up until this part:
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I wish, with all of my heart and soul that I could go back in time and change them, but I can’t. At this point, all I can do is continue to maintain the changes in my behavior I have made and to move forward.

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Don't talk about what you *can't* do, but what you are willing to do. Going forward, are you willing to do whatever it takes to--as the counselor put it--make amends? Don't just maintain your present changes. That may not be "good enough". Let your therapist help you through this and follow her guidance like your marriage depends on it. Let your wife see your actions EMBRACE the words you just wrote in the letter...otherwise they are just words.

--silverado