It would be "funny" if the gyaru, after complaining that her childhood friend has been copying and following her since they were kids, were now to fall for him because he has decided to follow what she is doing for the umpteenth time.
@Tearsax He's not just trying to follow her...he's trying to outdo her. That was the significance of her words about him seeming like the "old Ryo-chin". At some point, he stopped competing with her and just tried to copy her.