Actually, Hanabi really loved (in a weird way) Souma, but the author just wanted to make her dumb, she didn't know what she was doing to him, she thought it was actually something normal and a way of really show love, and I find that kinda of sad, it's not that she was being bad to him for the sake of being bad, she just didn't know that those actions of her were actually hurting him at all, as he never did nor said anything about them himself, he just accepted it, when he actually talked to her about it, she was in utterly wrecked state, 'cuz they were seemly nowhere to be ever together again, they talk about how she really feels at last chapter of the WN, and she can't stop crying, like for real, not those dumb things. He tells everything she did wrong to him and how that made him feel, she says that she was sorry, Hanabi tells him how much she was afraid of him going away, and of being hated by him (stupid right?), anyway, she didn't want to lose him, and by acting the opposite she did exactly that, I find it kinda dumb, like for real? She acted like a complete different person with Kirigaya, so she knew how much of a bitch she was being with Souma. If she was just being bad for the sake of being bad, that would be more acceptable, but it was not the case, at least in th WN, if it will be changed here, I don't know, I liked the concept of childhood friends being in love and ending up together, so it's a shame what the author did to her, cuz most of the time she didn't seem to really care about him, or what she was doing to him at all, just about her, and in the last chapter we see that was not supposed to be case, somehow...? Souma is very conflicted till the end, if he hates her or not, and no, he doesn't intend in any moment to go back to her or anything like that, but in he just never knew what to really think about her real feelings, if they were or not real, but one thing for sure, it was really scuffed what the author tried to pull there, from the start to the finish line he made Hanabi just look like a manipulative ex, with a narcissist complex, but then, he just tried to make her look like she didn't event know what she was doing, or maybe these people are really like that, but for what I know, they don't apologize for real, and she does that at the end and seems to really let him go.