Rights of Authorized User on a Credit Card

I am emailing to you regarding a credit card to which I was added only as an Authorized Buyer by my former husband. In '04 we jointly applied for the mentioned above credit card, however, within 2 weeks received a letter from the credit card services department which stated that they "were not able to open joint accounts in this time..., but instead would add me to this account as an Authorized Buyer only". He was also notified that "he and I, an authorized buyer, would have full purchasing ability and separate cards but it would result in him being solely liable for amounts charged on the account". Prior to our separation, December 2004, I always made payments on time or would pay off completely an outstanding balance. After our separation I have continued using and covering all charges on that credit card. I filed for a divorce by filing Marital Settlement Agreement with court. After it took place my former husband returned home and took a lot of valuable to me and my family items (collectible gold coins,etc). He was caught by my mother doing it, and quite frankly he did not deny anything when I confronted him about it. He promised to return everything to me but never did. In the mean time for the next 4 years I have used and covered in a timely manner all charges to the credit card. However, when I understood that he would not return anything to me, I told to my former husband that I would stop making credit card payments until everything would be returned to me. I gave him additional 6 months to return what he stole from me and my family but this time around like before he disregarded it as well. I have stopped making payments. He filed a claim with the fraud department at the credit card services that he did not have any knowledge about this card (stating that he never opened it) and all charges. And he went to a police to file criminal report that I have been involved into a fraudulent activity. I have presented all information (fortunately, I have had a copy of his credit card application, his initial charges applied to the credit card and finally, letter, which clearly stipulated that I was added to that account as an Authorized Buyer only). Both credit card services and police did not find any fraud and stated that he was the one who was responsible for all these charges. Almost one year later my former husband went to Family Law Court requesting payment of these charges and he won. I am wondering whether there is any law which I could apply in order to protect my rights of an Authorized Buyer or not. I would appreciate if you could provided me with some kind of solution regarding this matter.