I co-signed a store credit card for my ex when we were married. We forgot about the card at the divorce time .All joint credit cards were closed. Since then he has used the card for purchasing a tv(I'm not sure if there is anything else). He is making payments, but I can't close the account, only he can since it is in his name. What can I do to not be liable for this debt if he doesn't make the payments on time until it is paid off?