Guarded By the Alien by Dena Christy

Liana Drake’s life is spiraling out of control. Her beloved father is gone, her ex-husband has started turning up everywhere she goes, and she feels like someone is watching her. The last straw comes when she suspects someone has broken into her apartment and the authorities don’t believe her. Her only choice is to turn to her brother for help. His solution is to send her a Thonaxian bodyguard for protection.
Cale Arkon has been on Arrann Prime for two years as a bodyguard, and those years have been less than exciting. He leaps at the chance to protect someone who might actually need protection. But he is unprepared for the attraction he feels toward Liana when he arrives at her home. It could be her beauty, it could be her vulnerability, but something about her is drawing him to her despite the professional distance he tries to keep.
When the crimes against Liana escalate, they have no choice other than to flee. But the person stalking her knows her as well as she knows herself and seems to anticipate what moves she will take. The only advantage Liana has is Cale, the alien bodyguard she is slowly falling in love with. And she hopes it will be enough to save them both.