Borrower and Co-borrower who were never married bought house and lived in it together for 6+ years. Co-borrower moved out of home about 3 years ago when relationship ended and borrower has been living in home and making all payments. Co-borrower recently filed for child support which will not allow borrower to afford payments on the home. Can the borrower move out of the home, rent a home for less money, and sue the co-borrower for their half of the mortgage that would be due? Borrower has excellent credit, which is required for the future of his occupation and would have future earnings severely damaged by a foreclosure. The home would be listed for a short-sale but until sold payments would need to be made on the home.