Forgiving a Fae Warrior — Megan Van Dyke

Galen betrayed one king to fulfill an oath to another. Now, he is desperate to redeem himself and return to the Court of the Forest and the woman he loves. 
But when his plan goes terribly awry and threatens the life of a new friend, the path to forgiveness may be more treacherous than ever. 
A friends to lovers redemption story.
Note: This book takes place during and after the events of book 2, Bound to the Fae King, and should not be read until you have completed that novel.