All that said: Do you really want to continue living with your now ex-boy/girlfriend? There are two ways that this ends. First, you can negotiate for your boy/girlfriend to buy out your interest in the property. You're in an advantageous situation since you're not on the mortgage, so it would be far more logical for him/her to buy you out than for you to buy out him/her (although that's an option, but he/she should insist than you refinance the mortgage in your name). Second, one of you can sue the other for something called partition, which is essentially a court-ordered sale of the property. Such things are messy and expensive and rarely result in a sale for fair market value.