Since the bank or lender is the innocent party here they are entitled to be paid their due under the loan contract until such time as the obligations of you and your ex are changed - by him refinancing the loan in his own name. So, yes, you continue to be liable to pay the loan to the bank. However, you are jointly liable for the loan, therefore if you don't pay your share it simply falls on your ex to pay it.
If you did pay more than you needed to on the loan due to his delay in obtaining finance you could likely go back to the court and get compensation for what you paid over and above, however, this would take time and money. Therefore, if you take it into your own hands, whilst not strictly "legal" or the appropriate way to do things, you could simply stop paying the loan and leave it up to your ex since he is responsible for the loan after the date stated in the court orders.
