Your cancer simplifies everything. You cannot afford to waste precious energy worrying about what your H is thinking/doing-- you will need all your reserves. Take whatever help you can get from him, sure, but keep your focus squarely on you and your health. You can always go back to spinning about him later! If you don't step away from the drama now, you won't have anything to fight it with.
Think what a disaster your H would be as a single parent right now. Your D needs you-- take care of yourself so you can be there for her!
