Shielded Heart by Tiffany Roberts

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?