The Impulsive Shifter by Sara Summers

Moments before Isla pledges her life to another man, Zane Fulton walks in and changes everything for her. Running from the “perfect” man her family wants her to be with, she’s submerged into a completely different world full of shifters.
Zane is supposed to be the next-in-line Alpha of the grizzly pack his family has been leading for years, but it’s a job he never wanted. When Isla comes into his life and he realizes that she would hate being the Omega to his Alpha, he has to make a decision between his pack and the girl he’s falling for.
Sometimes having a soulmate comes with a price. Are Zane and Isla willing to pay theirs?