Danielle Steel 
Irresistible Forces 

Sometimes, your happily ever after can surprise you . . .
Steve and Meredith Whitman are happily married. Despite each having hugely successful careers, they have always found the time to prioritise their happiness together. And when Meredith is offered an extraordinary job opportunity in San Francisco, it seems like the beginning of an exciting journey for them both.
Perhaps they»ll also start a family at last?

But the move to New York isn»t quite so smooth, and when Steve has to stay in the City a little longer than planned, Meredith finds herself alone in San Francisco. Throwing herself into her new job, she can»t deny how much she enjoys the company of her boss, charismatic entrepreneur Callan Dow. Working late nights at the office, the two grow much closer than Meredith could have ever imagined.
As their lives begin to separate, Meredith and Steve begin to question everything that they once held dear . . .