From fictiondb:

Billionaire collects debt -- of passion!

Ben Dexter had become a powerful and respected businessman, earning billions. But money could no longer satisfy him.

For years, Ben had forgone a wife and family after becoming convinced Caroline Harvey, the woman he'd loved, had betrayed him. He'd never been able to find the kind of passion he'd shared with Caro -- and it was time to get her out of his system. He'd find her, indulge in a short, intense affair and then he'd finally be able to get on with his life. But things didn't go quite as he planned....