Give your H so much space he chokes on it! I know it's hard and it hurts, but if your H doesn't want to be with you right now, let him go. To h&ll with him and her, let them OD on each other.
Like Puppy says, work on you. Do what makes you feel good about yourself. Be the woman that any man would be crazy to leave.
Next time your H ask what he can do for you say, absolutely nothing as I am no longer your concern. Turn around and walk off.