Xima by Rich Blecher

Unaware that he is in the pivot in a battle of good and evil on two planets hurtling towards destruction, Zack Bates wants only a normal life with Katia, but General Tonya Skyler traveled across the galaxy for a warrior powerful enough to free Xima from swarms of predatory humans. She trains Zack into a savior with the strength to cleanse this tortured land, while also plucking Earth from certain destruction by roiling civil wars. Torn between his true love for Katia and his new-found love for the General, Zach must save two worlds from disaster, while rescuing his heart’s passion from servitude. Can he surmount these inner conflicts, hardening his hatreds into deadly weapons in his quest to protect civilization on Xima and Earth.