Man, I knew she didn’t have any logical reason behind her obsession with him but seriously? The whole reason why she’s trying to get back at him is because she was humiliated when she got hurt because she was being reckless. Insanity. Stupidity.
Also, clarification for this crazy lady, as someone on the ace spectrum, understanding that somebody meets the conventional standards for beauty does not equate to being attracted to them.
Finally, to the ML, what’s wrong with her having a strong sibling bond with her brother? Like that should just be the case. He’s her sibling. Most people have more than one relationship, whether it be with family, partners, friends, coworkers, children, servants, bosses, etc. etc. Even rivals and enemies are a kind of relationship. Each and every relationship is bound to leave an indelible mark. It’s what it means to care about someone, negative, positive, or complicated.
(Honestly, I’d be more concerned if she only had a bond with you. It’d be like those cases where somebody is a father, a friend, a teacher… Fill in the blank. Let’s not do that please.)