Bite the Bullet (Bell Buckle) by Karley Brenna

There's a thin line between love and hate, and the last person I want to cross it with is my best friend's brother.
Brandy Rose never opens up to anyone—not fully. She’s content to keep her feelings under lock and key, but when her dad shows up in town years after disappearing, her carefully crafted walls start to crumble.
Reed Bronson keeps everyone but his family at arm's length, never offering more than a grunt or broody stare. After his little brother suddenly quits rodeo and moves back to town, Reed is tasked with getting to the bottom of his disquiet. The only problem is his brother wants nothing to do with him.
When things start to escalate with her dad, Brandy turns to the one person who understands her past the most: Reed. But ever since that one night six years ago, they haven’t been able to set aside their feud for anything. Not even for each other.