My stepfather took out a lease for me and I make the payments.The lease is almost up and he wants out.?

I had planned on getting a loan and buying out the lease. Since then my credit has gone down the toilet. I was demoted at work and lost a salary. I wasn't able to make timely payments. (almost 180 days past due on a couple). To make a long story short I can't get the loan and my stepfather wants out of the lease. I'm already working on fixing my credit but it will be too late buy the time the lease is up. Any advice?