A Cowboy's Heart — Vanessa Devereaux

This story was first published by Evernight Publishing in 2013 as This Cowboy's Heart. It's been re-edited, and now told from a present tense point of view.
Gemma recently called off her wedding, so the last thing she wants to think about is romance and someone else's nuptials but then she gets a call from her sister with the news that she's getting married in five days.
Not one to let her baby sibling down, Gemma heads to Montana where she meets Cade, the best man and ultimate bachelor. After a night of passionate sex, Cade tells her not to expect anything more from him. They say absence makes the heart grow fonder, and when Gemma returns to visit her sister, she decides a visit to Cade is just what she needs but can she ever win a cowboy's heart?