How do I get my ex off the mortgage?

Divorce does not automatically remove either borrower from a mortgage. The loan remains governed by the lender's documents until it is paid off, refinanced or otherwise changed with the lender's approval.
Separate the property decision from the loan obligation
Ownership, mortgage responsibility, equity, and the divorce agreement are related but different. A deed controls title; the loan documents control who owes the lender; the divorce process determines how the spouses must handle the property between themselves. Removing a name from one document does not automatically change the others, so the sale, refinance, or buyout plan must address each part.
Changing the deed does not change the loan
The lender is not bound by a private agreement between spouses. A borrower generally remains responsible until the loan is paid off, refinanced, or formally assumed with lender approval. Likewise, being removed from the mortgage does not by itself transfer ownership. Confirm both title and loan changes in the closing plan.

