The general rule is that if you did not reaffirm the debt while you were in the bankruptcy that the debt was discharged. There are also court holdings in my jurisdiction that if a reaffirmation did not occur while you were in bankruptcy that nothing that you do or sign after the bankruptcy can be considered a reaffirmation. Either the reaff occurs while your bankruptcy is pending or it doesn't happen at all.
But, a consultation with a TX attorney familiar with the local rules and practices will be the best way for you to know for sure.
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You are never required to reaffirm a mortgage after Chapter 13 bankruptcy because 1) state law will still require the mortgage company to foreclose if you stop making payments and 2) after Chapter 13, you have brought all your mortgage arrearages back into current status.
So if you should have the house go into foreclosure, the bankruptcy discharge will protect you from any deficiency.
Hope this perspective helps!
You might want to visit with your attorney. He will be able to discuss with you personal liability for a mortgage debt after bankruptcy. Do not just take action without getting advice.
This answer is not legal advice.and does not constitute tax advice. This answer does not provide advice related to tax shelters. Consult an attorney for legal or tax advice.