Hi
Even though I was divorced (amicably) I'm am no expert on this. My ex paid her half and that was it.
I notice, in the newspaper classified section, "responsible for my debts only" ads in the legals. Might that be a way? I would definitely seek legal advice, either by hire, or on a related website. An occurrence that common should have an easy answer, I think. Did you have an attorney for the divorce?
This happens a zillion times/day. It must have an easy solution. Divorce should end any fiduciary relationship/responsibility after the decree.
warrens