I don’t want to get too personal, redangus... but does your current wife know of your feelings and the letter? If she does... she must adore you. Not all women would be quite understanding of that particular situation. IMHO
She knows about my feelings, but not the post. And yes she does. She told me once that she knew she could never replace my first wife, but that she had the same feeling for me that I had for my first. I love her very much and we have had a great life together, but that doesn’t change history.