First, if you are sued, your insurance policy likely has language that states that your insurance company will hire an attorney to defend your husband in a law suit. Further, the vast majority of these cases settle. Lastly, even if the other party is awarded a verdict over the insurance policy amount, unless you have significant assets, the other party will not likely come after them, but it is possible.
The only other thing I would add is that I would not recommend attempting to divorce as a result of this, as the court would consider this fraud.
Good luck and I hope this helps.
Nothing in this communication should be considered legal advice. Nor should this communication lead you to believe that an attorney-client relationship has been created. Only after thorough analysis of your case with you in my office can I provide effective legal advice on your specific issue.