SPOILER

From the spoilers I read I think he betrays her because he was possessive of her. Sort of like a “I want her all to myself” type of “love”.

ok got it! thank you for telling me!

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what I understood from past spoilers was the eclis found the real sister so he could have Penelope to himself, but then it messed up the story and the family was suspicious of the real sister and eclis. I think Penelope gave up on him too because she also couldn't get his meter above 99%???

ok thank you for telling me!

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Yeah, he did.. He sided with Yvonne because he became obssessed with Penelope and wanted to free (aka take her away) from her "family". (╯°Д °)╯╧╧

I feel bad for Penelope she must've been hurt.
That is not love and was wrong of him to do that.
Thank you for telling me!(づ￣ ³￣)づ

It's true there's an affection present between the two but Eclise conveyed it in a twisted way and betrayed her to make it that Penelope would only depend on him.

So basically eclis betrays penelope just so he can free her from her family, so helping yvonne return in family, and have her all to himself? Wow that’s a cliche tbh

No noo. Okay so they (Pene and Eclise) knew they both using each other. Eclise knew from the start Pene just using him for her own goals. That was why his affectionate meter can't go beyond 99% coz 1% was always the hateful feeling for her. Pene can't really deal with it coz everything after his betrayed became messed up. For Pene he was the only way to gained her goal before the d-day. But he said he want to free her and runaway with her. Still Pene knew it wasn't just like that. She know he makes excuse to runaway with her cause he has this goal to runaway with his people. Eclise is the illegitimate prince from defeated country

He's a yandere boi i'm tellin you

The best explanation