Actually, Helios was not in love with Hestia in the way most people think. Helios wishes for someone that hold similar ideals with him, someone that can work together with him. His love for Diana is like burning firewoods, but now that fire has died down, he was left with nothing but ashes. Those ashes are the realization that marriage is never going to last with just some fleeting love.
I mean if we are talking about the past, Helios loved Diana as much as Kaelus does. It's only natural for him for wanting to be with Diana, and it's not like Diana can pick both of them. One of them was bound to get hurt. Diana pretended as if she was considering Kaelus' feelings too but from the start her feeling has always belonged to Helios. Kaelus is just a collateral damage.
Also what most people forget is what actually hurt Kaelus is not the fact that Helios and Diana got married but the abandonment from his two bestfriends. (SPOILER ALERT) Kaelus was actually tasked by none other than Helios to annihilate the entire Orcus Ducal because they were threatening the empire and conspiring a coup d'etat. He was not doing it solely for Diana's sake and he decided to take the blame himself for the sake of the empire's stability. But Diana instantly saw him as nothing but a murderer, didn't care about his reasoning, and decided to distance herself completely from him. Unfortunately Helios always went with Diana's whims without even considering his friend's feelings. Those are their sin to Kaelus.
Actually, Helios was not in love with Hestia in the way most people think. Helios wishes for someone that hold similar ideals with him, someone that can work together with him. His love for Diana is like burning firewoods, but now that fire has died down, he was left with nothing but ashes. Those ashes are the realization that marriage is never going to last with just some fleeting love.
I mean if we are talking about the past, Helios loved Diana as much as Kaelus does. It's only natural for him for wanting to be with Diana, and it's not like Diana can pick both of them. One of them was bound to get hurt. Diana pretended as if she was considering Kaelus' feelings too but from the start her feeling has always belonged to Helios. Kaelus is just a collateral damage.
Also what most people forget is what actually hurt Kaelus is not the fact that Helios and Diana got married but the abandonment from his two bestfriends. (SPOILER ALERT) Kaelus was actually tasked by none other than Helios to annihilate the entire Orcus Ducal because they were threatening the empire and conspiring a coup d'etat. He was not doing it solely for Diana's sake and he decided to take the blame himself for the sake of the empire's stability. But Diana instantly saw him as nothing but a murderer, didn't care about his reasoning, and decided to distance herself completely from him. Unfortunately Helios always went with Diana's whims without even considering his friend's feelings. Those are their sin to Kaelus.