Harley spent months trying to get away from her abusive boyfriend. The last time he got his hands on her, she knew he wouldn't stop beating her until she died—until Rage showed up. He took her back to the club to be cared for, and she found out she fit right in. A bonus was her feelings for Rage. But something unforeseen happened that took her away, and when she came back, she thought she'd lost him.
Rage thinks Harley was fated to be with the club because of her name alone. He tries to heal her heart and ends up losing his when she has to leave suddenly with no promise to return. His mistake was trying to replace her with another woman, which might cost him and the club.