Another option would be to start throwing his letters in the trash without reading them. Writing him is not necessarily going to make him stop writing you. Maybe it would be worth thinking about why you needed this other man to save you? Why do you think you were only able to feel done with your AH when you met someone new? How would it feel for you to not be involved with anyone romantically? Your life is not over. You're alive and kicking and free to live as you choose.