Shielded Heart by Tiffany Roberts

He’s an alien crime boss who always gets what he wants—and what he wants is the shy, timid human female who happens to be his fated mate.
Arthos, the Infinite City, is a place of alien wonders and indescribable beauty—and, most importantly for Samantha, it’s also halfway across the universe from her abusive ex-fiancé. She came to the city desperate for a fresh start, but she finds herself downtrodden on a world of aloof alien beings with little hope of finding her place—and a good chance of being kidnapped or killed before she can even settle in.

At least until she is saved by an irresistible alien with piercing eyes and a seductive smile.
Alkorin is the living embodiment of temptation, and he makes no effort to disguise his desire for her. But when his past threatens to drag her into a dangerous underworld, she discovers he isn’t who he claims to be. After enduring so much suffering, can she bear to take a leap of faith with this mysterious alien? Can she trust him with not only her life, but her heart?