Get a divorce or report your husband to the police.
lets do one better - get to know the guy before you start screwing him. It's pretty clear from how a guy deals with situations and events what kind of man he is. If women would THINK half as much as they FEEL - there would be far fewer chances of them finding themselves in situations where this kind of thing is a problem.
Stand up for what is right, even if you have to stand alone.
The truth is that society and civil order can break down really quickly under the right conditions and since we are in some pretty uncharted territory here, it's damned hard to say what can and can't...