Instead of amending your return, you can file Form 8857, Request for Innocent Spouse Relief. You do not need to file an amended return to do so. If your request is accepted, you will receive the portion of the return that you are entitled to based upon your income. The amounts and the credit will depend upon how you complete Form 8857.
For information on Form 8857 see: https://www.irs.gov/uac/about-form-8857