She clearly saw everything through different lenses, and doesn't understand why what she did was wrong. Maybe in her view, she was just trying to shape him up into a proper boyfriend, and thus he should be grateful for that, and not that she was just constantly putting him down, and making him miserable for her actions.
She wasn't purposely malicious while growing up, but she has no self awareness, which in it's own way it's more fucked up than actually being aware of how much of a piece of shit you are, and still doing it.