I agree with Nowhere...The energy and emotion you spend on writing out your thoughts may be therapeutic and cathartic. Maybe good to do that for yourself, but by sending out this letter to him, you are still giving him power, yes, POWER, by revealing your anger and hurt. You need to take away his power by focusing on your own happiness....like Nowhere said..
I'm not judging you or chastizing you on this, because I've done such things myself, only to later wish I had just remained silent. The man is a cad and has moved on. By remaining silent, concentrating on your own wellness, you take away his power over you.
Love
Patty