Fate by Emily North

Sadie Sullivan has always been a winner.
With a loving family, all the right friends, and the hottest boyfriend, life was good—but boring. So she left it all behind.
Her new life in Lake Conrad has had its ups and downs, but one big downside is her relationship with her new boss, Liam Cohen, who hates her for unexplained reasons.
Liam remembers Sadie, even if she doesn’t remember him, and he’ll be damned if he lets her distract him and rule his emotions like she did in the past.
With the holidays approaching, both Sadie and Liam are forced together more and more. As they begin to realize there’s more to the other than meets the eye—or that either of them ever cared to see—will past mistakes come back to haunt them?