Promise Me by Christine Kingsley

Just a fling? Famous last words…
When Colin Caldwell returns the small seaside town of Breakers Bay, he only three goals in mind: escape, relax and have a good time. He’s a notorious playboy, but why wouldn’t he be? As heir to Caldwell Enterprises, he’s had all the girls in town lining up for a summer fling ever since he was eighteen.
Except for the one he really wants.
Hadley Hendrix has always kept Colin firmly in the friend zone, ever since he started showing up every summer seven years ago. She knows he leaves a trail of broken hearts in his wake, and she refuses to be one of them.
But this year, neither can find the will to resist what they’ve always wanted.
Can Hadley be his for the summer and keep her heart intact when it inevitably comes to an end? Because what Colin least expects is for Hadley to get so close that he doesn’t know how to break away again.
Or if he even wants to…