
I generally dislike him even in the novel but her options pool is really limited...
Every one of the MLs has been an ass to her at some point except Vinter and he can't accept for...reasons. I guess from her very narrow selection pool (brothers out coz they're family), eclipse's oopsie and vinter possibly walking off the face of the planet...

Some type of spoiler.
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apparently Vinter betrays her in the future...doesn't trust her or something. Honestly Kallisto is the best option because he's seriously funny in the future and then whipped. He's just got trust issues as we can see from his family.Doesn't excuse his shitty behaviour now but he's the best option not because he's slightly better but simply because of major character development.

Spoiler to spoiler!
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I know he does that whole using her as bait/testing her to see if she was a spy bit but that wasn't exactly abuse? He has good reason to be sus too, MC suddenly shows lost magic powers out of nowhere, esp when magic children have been going missing. That and the brainwashed kids showing up just and MC advocating for them - either she's geniunely good or she's using pawns to gain his trust, he really couldn't tell at first.
He doesn't betray her per-se but I guess it's also true that while they might make good friends, they don't have too much chemistry. Even towards the end, I think he's mostly motivated by guilt - not a good foundation for any relationship.
LMAO WHAT AM I THE ONLY ONE WHO STILL DISLIKES THE PRINCE?!?!