His character development goes down the gutter ( ╥﹏╥)
Spoiler:
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Eclise knows FL is using him for some reason but falls for her anyway. Honestly, I believe FL is to blame also since she basically manipulated him and then threw him away. But he's actually the one who brings OG back into the duke house this timeline. He somehow believes that if FL gets kicked out of the ducal house, he'll be the only one she can rely on and won't be able to leave him (he can sense she doesn't love him). This betrayal leads FL to cut him off and desperate, he continues to collude with OG afterwards trying to kidnap FL (succeeded the 2nd time). A lot happens in-between but eventually, Eclise saves her from a dragon attack and his body is missing and presumed dead. Now the novel ends there but fret not, in the several side stories we get, Eclise is still alive but an amnesiac. He finds Penelope again and stalks her for a while with a strong urge to kill her. He eventually chooses not to and leaves to become a mercenary. His story ends there... as someone who was rooting for him the most in the beginning, it's pretty disappointing ik but you'll see why gold lion boy is the best for FL
Why did I have to fall for Eclise ╥﹏╥