How you protect yourself legally is to file for divorce. Anybody he hurt in an accident could go after the marital assets, but not your income (I would double check that with your attorney).

As for him going after his worker comp money, he effectively and thoroughly comingled it with a marital asset. Which means that both of you own the house equally. If you are in a community property state, you get 50% of the equity, he gets 50% of the equity. An equitable distribution state may do a different split.