Liability on Loan

The simplest way is for your boyfriend to pay off the loan by placing a new mortgage in his own name.  Beyond that, it's not easy.  Sometimes the lender will agree to let you off if your friend can prove that he's qualified to carry the payments on his own.  You can certainly inquire of the lending institution.  But don't count on it.  It can be very difficult to be released from liability, even when you no longer own a share of the house.