Faraad by Elle Harper

Former thief and Earthen rebel Kat Allan is used to being on her own. In fact, she prefers it that way, even on the alien planet upon which she and her four crewmates. Other than her best friend Harper, Kat has managed to keep just about everyone at a distance. And it’s all for their own good, as far as she’s concerned.
But an alien male with a quick mind and a generous spirit puts her walls to the test and has her questioning just how much she wants to keep herself walled off from the possibility of friendship, and maybe more. Could she have love? A sense of belonging? And is she strong enough to take a chance on it?