get on the phone with the loan officer and let them know who you are, that the address provided is incorrect. i hope he did not use his interest in the house as collateral.

he may have used your address to show he's a property owner and increase his creditworthiness to qualify as a guarantor and probably dodnt tell you on his rationale that technically he's still on title. not a respectful move on his part. you should cover your bases, its not your responsibility to aid him in whatever he's doing. call the bank and get your adress out of this potential mess.