Erevu just learned the truth about his father from ... himself. Scar told him everything. From the beginning of his plan, after taking power. Erevu then he realized that his scar is not a loving and caring father and king, but ... traitor.
"Get used to it, because one day you will be the same as me!" - Shouted before he left.
Erevu © Me
Scar, background and poses © DISNEY