Fall Into You by Charlène Boutin

The night my heart got broken, I was certain of two things:

1. My partner was a lying cheat.
2. Will Béchard knew all along.

One year into single parenthood, Sophie can feel her dreams — and social life — evaporating. Her best friend Avery is traveling the world, her possibly ex-friend Tania is icing her out, and her party planning business is at an all-time plateau.
But the minute Sophie decides to do something for herself? The past comes knocking.
Will never quite got over the flirty blonde who definitely ogled him at the club…ten years ago. If she hadn’t chosen his (ex) best mate instead, maybe Will wouldn’t have racked up quite so many one-night-stands since.
Still. What Could Have Been is going to have to take a backseat to Right Now, because he’s about to become Sophie’s business consultant. Even though, as far as she’s concerned, Will is Public Enemy No. 2.

Forced together by Fate’s idea of a joke, Sophie and Will scramble to keep things professional. As profits go up, old defenses fall down — but Sophie can’t help asking, why would he stay?