Rejected Wolves by Jasmine Wylder

A broken heart can’t save the world.

Her two Dark Princes won’t stop fighting, so Parker has left them both to accept a position with War. She is close to figuring out how to open the doors to Apocalypse and end the fighting between the four houses of the Magical Academy of the Dark. She just wishes she didn’t have to do it alone.
When assassins start coming after her, not even the Phoenix Seed can save her. Leonidas and Jasper must set aside their differences to protect her. If they can’t get along, they’ll both lose her and any chance they have to open the Apocalypse doors.
After everything that’s happened, Parker longs to trust them. But how can she believe them when they say they’ve changed? And if she can’t trust them, does she stand a chance at saving the world?