If you did not specifically sign a document entitled "Reaffirmation Agreement," and have such document approved by a judge, then your mortgage is already discharged.
Basically, all debts are discharged unless a debtor reaffirms it. But since reaffirming a debt contradicts the purposes of filing for bankruptcy, it cannot happen unless the very specific document is signed and a judge approves of it. If that didn't' happen, then you do not owe your mortgage. And you would know if you agreed to that situation, since judges will not approve of reaffirmation agreements
unless a debtor is fully aware of what he's getting himself into.
Assuming the mortgage was discharged, then it sounds like you did a "ride through," which is where a mortgage is discharged, but the lender does not foreclose because the payments are still being made. If that's what happened, then you are no longer legally liable for the debt because it was discharged. However, since the lien survives bankruptcy, then lender can still foreclose if you stop paying.
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