Because of Miss Bridgerton (Bridgerton Series) (Rokesby Series, 1)

Everyone expects Billie Bridgerton to marry one of the Rokesby brothers. The two families have been neighbors for centuries, and as a child the tomboyish Billie ran wild with Edward and Andrew. Either one would make a perfect husband . . . someday. There is only one Rokesby Billie absolutely cannot tolerate, and that is George. He may be the eldest and heir to the earldom, but he's arrogant, annoying, and she's absolutely certain he detests her. Which is perfectly convenient, as she can't stand the sight of him, either. But when Billie and George are thrown together unexpected sparks begin to fly. When these lifelong adversaries finally kiss, they just might discover that true love can be unforeseen.