I have worked with a business partner for 3 years. He lent me money over the past 3 years as our production was not what he promised he would be. In his own words "he never expected me to pay it back". I now am leaving and he wants me to pay back $29,000. He says he has a piece of paper on which I signed that I owe him the money. My question is "Do I owe him this money? What about his broken verbal commitments to me? I would never have "borrowed" money if he did what he promised. How do I protect myself?