Betrayed By the Alien Warrior by Tori Kellett

Betrayed, kidnapped, and nearly beaten to death, Lexie finally wakes up with no memory of who she was, and told her place is as a slave, serving a cruel master.
When she is sold to the temple to become a servant of the sun goddesses because of her yellow hair and pale skin, she thinks life is getting better, until she finds out that “serving” them involves being sent to them in person. She knows she has barely days to escape or her dreams of loving a pale silver-hued warrior will never come true.
Tamrath—already drowning in guilt because he’d been forced to reject her—has barely four weeks to find his Earth female before war breaks out and all Ishtaan tries to stop the slaughter of the natives in the Lakesh mountains of his home planet.
In a race against time, Tamrath doesn’t know what may be more impossible, battling the fanatics about to execute Lexie, or begging forgiveness and convincing the love of his life he was wrong to ever let her go…
And not making that mistake a second time.