Hi, BD. Your letter is really heartfelt. Really tugs at the heartstrings because it's so raw.
Do what you feel you must. Although sitting on it for a week might be good. Because in the long run (the game of life) a week is nothing. But you'll run through the gamut of emotions during that time.
I challenge you to go a week with complete NC and then send the letter. Show yourself that you can and will do what you say.
Just my thought, don't do it if you don't want to!
