(((Pajarito)))
My XAH moved out of town into a luxury penthouse apartment, and makes a point of showing the kids (via video chat) slideshows of glamorous parties he's throwing--with all these very stylish looking, young, happy people. Meanwhile I'm raising the kids by myself and paying off his debts. All to say--I feel your pain.
But you know what? No matter where he goes, he has to live with himself, just like your AH does. Anyone can change a tire. Being a truly devoted husband and father is a lot harder work. He'll show his a$$ to this woman. If I were you, I'd feel sorry for her and count yourself lucky.