Legal Question in Real Estate Law in Maryland

It's unlikely they will do so, but if it's just in your name and they sued you on the defaulted note it would be subject to a collection action. The greater risk is the negative impact on your credit score from the foreclosure. It's fortunate that you were able to buy a new home (presumably with a mortgage) despite the old one still on your record. What usually happens is they foreclose and just end up with the property or, in some cases, a 3rd party bids it in at the foreclosure sale and pays off the mortgage. But if it's underwater that probably won't happen. Meanwhile, you could pursue your ex for contempt of court assuming your agreement was part of the divorce judgment.