SPOILERS:
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After Diana lost all the public money she put in the investment, and it was revealed that the temple was corrupted (she’s affiliated with the temple). In consideration of all this, Hestia had managed to turned the entire nobility and people against her as she is unfit to be a ruler. The nobility started protesting at the palace to obtain Diana’s abdication, but if they succeeded that would lessen the imperial authority. So, Kael made the choice to go to the palace and tell the nobility to give up on the abdication, to preserve the imperial power - as head of nobility, they all respected his decision. Even if he told Hestia beforehand and explained why, Hestia took it as a betrayal and realized she was never going to get her revenge because she believes Kael will always save Diana and she’s just an extra character who’s not meant to be there, and this led to her dangling herself on the edge of the balcony because she just wanted to go back home at that point. Seeing this, Kael lost his shit because it was definitely a parallel to his own suicide attempt.
https://readnovel.eu/chapter/for-my-derelict-favorite-43 Thats the final chap where everything goes down
I see how you might think that! He actually loves her obsessively by that point already, but the novel explains it better than I do. He told Hestia beforehand to make her understand that it’s his way of letting Diana+Helios go, put all of this behind them and live in peace as duke and duchess under a strong imperial power. When he sees her depressed and border “suicidal” (she clarifies she’s not actually suicidal and just lost af) afterwards, he literally locks her down with him in her bedroom and refuses to let her out of his sight, staying at her bedside and crying/beating himself up 24/7 because he sees how she misunderstands his intentions and loyalties. As for Hestia at first it seems that she’s depressed due to Kael prioritizing Diana and Helios, but then she clarifies herself that it’s more about her not understanding her importance and role in the novel if she can’t even succeed in her revenge. Super good angst, the novel is definitely worth reading ;9

I did read the spoiler before but I forgot. (─.─||)
How there was a situation where everyone is against Diana. Or something like that. Then Kael was the one who took the side of Diana, more like agreed with her. But Hestia took this as Kael still in love with Diana. And then when Hestia was at their house, at the edge of balcony. Kael saw this and was terrified and thought Hestia was going to jump.
So my questions is, what was that situation where Kael took Diana's side.
(Please confirm, cause I'm starting to believe I made it up ⊙﹏⊙)