So It Goes by Jennifer Probst

Two people with little in common but business give pleasure a shot in a charming romance about fate and taking chances by New York Times bestselling author Jennifer Probst.
The truth? Lonely advertising rep Malia Evergreen is still waiting for a soul mate, marriage, and a family. The lie? Telling every busybody she knows that she’s met someone. Now it’s a matter of finding him. Malia needs a date for a wedding. In a pinch she strikes a bargain with her former client, CEO Palmer Matterson—an arrogant, defiantly single, alpha billionaire whose best quality is insincerity. The perfect fake date.
Palmer has wanted Malia from the first moment he saw her. A challenging, sexy career woman who knows what she wants. It’s just not him. Not yet, anyway. This is Palmer’s chance to win her heart.
As fate throws them together, Malia unravels the layers of the man she thought she knew and, against the odds, finds herself falling in love. Palmer’s falling too. If only they can convince each other what they share…a belief in a happy ever after.