Cosignor, Bankruptcy, Car loan

I had a joint Mazda car loan with a guy in 1998. He has filed bankruptcy on the car and is out of the bankruptcy. Is there a way for me to have this removed based on his bankruptcy if not what should I do in this case? Keep in mind he is not cooperating with me to help.
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If you cosigned it will show on your account
if it is from 98 it should be about off and you have new good credit anyway.
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He co-signed for me. Is there a route you would suggest I take to handle this.
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Use my dispute form
say it is not yours
http://www.oskie.com/credit-dispute.htm