What are my options?

I truly feel bad that this has happend to you. Your ex can quit claim himself off the deed. He is right, though, he will be responsible for the loan if you default. Call a lender that deals in mobile homes, and get some advice on doing a refinance. Your ex should be willing to let you pay off the original since he gets credit for the payoff and he will no longer be liable for the debt. Remind him that if he and g/f ever want to buy anything together, this debt will be considered in his debt ratio and may make it harder for him to buy. Call the lender first to see if you qualify for a new loan on the mobile. If all else fails, call an attorney and get some advice on how to relieve yourself of the obligation to pay him when you sell! You will be in my prayers. Good Luck