Take it from someone who had a W that knew how to run up credit cards- PROTECT YOURSELF ASAP. Contact a lawyer right away and discuss this. He/ she will probably suggest that you close the account the mortgage is drawn from and set up a new account in your name only and have the mortgage drawn from that. Do you have a S agreement in place? If not then consider it (if it's allowed in your state). Designate the date she moved out as the date that you ceased to be a couple, and that date should also be the cutoff on which you each became responsible for your own debts. Without some kind of agreement in place you are at risk of your W slapping half her new debt on you. Good luck!