After Divorce, The Billionaire Crushed on Me

Cindy's husband wanted out of the marriage and arranged for her to walk in on him with another woman, which did the job. She was on the point of throwing her wedding ring away when she came across Kevin, who had run through his funding partway into an experiment and been thrown out of his hotel on the assumption he was homeless. She handed over the ring to settle his bill, and the experiment went ahead and worked. Years pass. Kevin makes a fortune off it, and once he is a billionaire he puts people on finding the woman who paid the bill. Getting from there to anything steady takes the two of them through a long run of trouble.