To Start Again by Rachel Forno

After an explosive fight with her boyfriend, Jessica Lane secretly packs up her life in Chicago and starts over in small-town Rosefield, Illinois. Finally rid of her abusive, controlling ex, she finds comfort in her new freedom.
Jessica plans to take things slow and focus on herself for once. That changes quickly when she runs into a new coworker, IT guru Nathan Miller. Neither can deny their feelings as they bond over their traumatic pasts.
Ex-boyfriend Rick Coates doesn’t take kindly to being ghosted. With nothing to lose, he utilizes his military background to do anything it takes to get Jessica back—even if that means eliminating the people closest to her.
Jessica and Nathan must not only fight for each other, but also against a terror lurking around Rosefield.