Credit card problem

Can I be responsible for charges after the date of my divorce, made by my exhusband on a joint credit card that was overlooked? How do I go about keeping this from affecting my good credit?

Review your Settlement Agreement and see what was said. Call your matrimonial lawyer. The mistake, which hopefully you've corrected, is having a joint credit card post divorce. Even if your agreement is clear that may not mean the problems are over for you the credit card company is going to want to get paid and you're joinly liable. Ask your lawyer whether you can pay the debt to keep your credit clear and then sue your ex for the money. You might try calling the credit card company and explaining the situation, but I would hold my breath. Hopefully, your attorney will be happy to help you address all these issues and importantly, make certain nothing else was "overlooked".