Yes. You can cancel any reaffirmation agreement for sixty days after it is filed with the court. You can also cancel at any time before your discharge order. To cancel a reaffirmation agreement, you must notify the creditor in writing. You do not have to give a reason. Once you have canceled, the creditor must return any payments you made on the agreement.
Also, remember that a reaffirmation agreement has to be in writing, has to be signed by your lawyer or approved by the judge, and has to be made before your bankruptcy is over. Any other reaffirmation agreement is not valid.