She hates him for getting all the attention.
She hates him for being nice all the time.
She hates him for always saying sorry, even when he's not at fault.
She hates him for being too neat and tidy.
She hates him for being whiny.
She hates him for always getting what he wants.
She hates him for having more friends.
She hates him for being better, in everything!
And she definitely hates him for preferring her.
But she hates him most of all because this feeling may not be hate.