My response:
In most States, there is a "marital presumption". That is, there is a "rebuttable presumption" that a marital partner has the "presumed right" to act on behalf of the other marital partner if, doing so, and the purpose of which, is to "promote" the marriage.
Let me give you an example - - Your husband is gone away, and the checkbook is in his name. The gas bill is overdue, and your heating is about to be turned off. You are "presumed" to have his "authority" to sign one of his checks to pay the gas bill because doing so promotes the welfare of the marriage - - that is, when he gets back home, he won't find a frozen carcass on the floor that looks like his wife.
So, if you signed his name for something that ultimately "promoted" the marriage, it is highly unlikely he'll be able to do anything about it.
Check with a local family law attorney so that you can give that attorney all of the specifics and details of what happened and why it happened.
IAAL