The Demon King of the End of the World: the Rise of the Demon Clan

(Fantasy, two male protagonists. Large layout, rich plot, deep content, both invincibility and upgrades.) My name is Mu Yang, and I am the most powerful king of the demon clan. I was born between heaven and earth, and I am able to conquer the world since I was born. But I was betrayed, and my beloved other half plunged me into a place of eternal destruction. I was defeated by the Emperor of Heaven and sealed in the artifact Fengchen Ring for thirty thousand years. Thirty thousand years later, the end is coming, and demons from outside the territory are attacking. In order to resist the foreign enemies, the Emperor of Heaven is forced to release me. This time, I want to travel through three thousand worlds, sweep away the demons outside the realm, destroy the Lingxiao Palace, and become the supreme king of the universe... Just kidding, I actually just wanted to ask her, why is she doing this? Why hurt someone who loves you the most.