Only Today — Erica Storm

Twenty year old Lilly Miller thought she had married the perfect man when she accepts a proposal from the richest businessman in her small town in Virginia. He's distinguish, handsome, and soft spoken. He promises her a world she thought she never could have. When she arrives in Seattle on her wedding night, she discovers who she had married.
Caught in a loveless marriage, with a controlling man, Lilly has two thoughts: find happiness where she can, and get the hell away from her husband. Will she discover her husband's secrets or is she long past caring?

Twenty-nine year old, Anthony Perretta, laid off from his high paying, high powered job, takes his severance pay and invests it, and as he waits for the return on his money, he's asked as a favor to a friend to drive around a billionaire's wife, and in return, he will receive an obscene amount of money.
The job: guard the billionaire's wife night and day, don't let her out of his sight, and report back to the billionaire husband.