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Soulmate... For the Olympian Gods, that was the most sensitive, taboo, and painful topic.
The concept of soulmate originated from Gaia.
Since her birth, Gaia always longed for a companion. But that didn’t mean she wanted just anyone. No, absolutely no. Gaia wanted a perfect mate, someone who not only erased her loneliness and loved her, but also completed her soul.
And thus she created Uranus, her husband, her equal, her another half, her soulmate.
At the beginning, the concept of soulmate was proven true because Gaia looked so happy together with her husband. But then Uranus imprisoned their children deep within Earth, where they caused pain to Gaia, and Gaia retaliated by castrating her own husband with the help of their other children.
The separation of Gaia and Uranus sparked doubts on the concept of a soulmate.
Cronos and Rhea also did not help restore the belief. They even further damaged it.
Even though Rhea was his soulmate, and eating their children would obviously hurt Rhea's heart, Cronos did it anyway. It is considered as proof that being soulbound didn't mean your soulmate would prioritize your happiness above theirs.
Rhea's actions to save her youngest son also proved that a person could betray his own soulmate.
Together they showed how imperfect the concept of soulmate was.
Zeus was one of the many children of Cronos and Rhea who no longer believed in the concept of soulmate. In fact, Zeus was determine to ignore his soulmate and proved it by marrying Metis even though the two of them weren't soulbound.
Well, at least that's what happened until King of the Gods fell in love with his own sister, and once Zeus learned that him and Hera are soulmates, Zeus immediately got rid of Metis so he could marry Hera.
For a moment Zeus's actions improved the Olympian's belief in the concept of soulmate. But because Zeus kept cheating behind Hera, making his soulmate trapped in an endless cycle of heartbreak and miserable, once again the Olympian doubted the concept of soulmate.
Unfortunately, Poseidon was just as bad as Zeus.
Hades on the other hand... Hades’s story is what nailed the Olympian to no longer believed in the concept of a soulmate.
Because soulmates made by Gaia, Hades hold fast to the concept. For Hades, doubting soulmates meant doubting Gaia. There's no way Gaia was wrong. And thus, Hades vowed he would never stop looking, and only would only settle with his soulmate as his partner.
(Beside, different from his other siblings, Hades had a chance to feel how happy Rhea and Cronos together, before Cronos was overcome by fear and ate his own children. Hades has always wanted to feel that happiness.)
But then Eros and Persephone happened.
Since the beginning Hades had despised Eros. For him, Eros’s arrow, which was able to make anyone fell in love, was an insult for soulmates. That was why Hades always mocked Eros.
Who would have thought Eros would dare take revenge on Hades, by shot the king of the underworld with his arrow, which made him fell in love with Persephone, the first young lady he saw.
For a long time, Eros's arrows made Hades forget his soulmate and be happy with his wife. But then Hades gets involved in Holy War with Athena, which made him fight continuously with Persephone, who didn't want to understand her husband’s reason and chose Athena's side instead.
Their quarrels were fading away the effect of Eros's arrows. But it needed a meeting between Hades and his soulmate for Eros’s arrow to lose its power completely.
And when that happened, Hades was furious.
Hades was not only furious with Eros, who has made him break his sacred oath by using cheap tricks, but also at Gaia for gave him Pegasus saint as his soulmate.
After all the long waiting, the loneliness he endured, and all the effort and sacrifice he made to find his soulmate, turned out that his perfect partner was the embodiment of everything he hated? A mortal human, a fool, a light incarnation, Athena’s number one warrior, the great sinner of heaven, his arch enemy ?
No. Hades would not accept this. NO!
(And thus the Olympian Gods no longer believed in soulmates. How could they, after saw how Hades’s soulmate was the one who has always been the key of Athena’s victory in defeating Hades since the age of myth?)