My Secret Billionaire Bodyguard by Cate Remy

Dahlia Dean broke Cy’s heart years ago when they were eighteen. Now, after witnessing the murder of one of her celebrity clients, she needs him to protect her from the killer still on the loose.
Cy Walker, former Special Forces soldier, didn’t think he’d ever see or hear from Dahlia again after he enlisted. At the time, she was what he considered superficial, obsessed with appearances and worried only about her dream to be a hair and makeup artist. Now, as the owner of a billion dollar security company, it’s his duty to protect her at all costs. Cy realizes how Dahlia has matured. She’s responsible and caring. He finds her even more attractive. Can he do his job, or will the memories of the past and Dahlia’s presence prove to be a dangerous distraction?