In October 2005 I had a car reposessed. My Ex-wife and I purchased the car together. Her signature was on the buyers agreement in 6 places. Mine only once, I was also designated as the co-buyer. In December of 2005, I received a letter from the Credit Union stating that I owed them $6,354.29 plus interest. In October of 2006 my ex-wife settled in court on the car debt for $4,000. Today, December 30,2007 I received a summons to court for the outstanding $2,845.10. Am I responsible for that amount even after the debt was settled with my ex? This is in the courts of Colorado