eurofag here... if this scenario was in my country that guy would probably get house and kids, while bitch would get wrecked...
unless he signed pre-mariage contract (treaty? I don't know correct expression) or was dumb enough not to hire a lawyer and defend himself at the court
What your thinking of is called a preen-up it establishes what goes to who incase of divorce regardless of circumstance. And those that have been proven to have cheated lose any chance at gaining wealth through divorce in America