Sometimes I wonder if this kind of bullying really exists... Or, it's actually more hyperbolic things in manga or manhwa.
From one perspective, we could say Asahina is a weak-willed and egoistic girl. Without her knowing, for her "safety", she did try to toy another person's heart, Haruto's. Despite probably she'd be fallen in love with him later, but we know that her intention wasn't pure at all.
Just a bit guessing, the story would be all about how she's tortured with guilty feelings in each chapter.
I hope this Asahina would not keep being a weak girl. Or else, there'd be a chapter that the bully would request Asahina to break their relationship and they will laugh hard behind Asahina saying it's all just a farce. I just hope it's not going to happen later.