The worst is that normally the girl should cut ties in respect of her boyfriend but somehow she feels some obligation towards this guy. Thats not confidence... hes arrogant and selfish. I came to deeply dislike this part of the story.
Couldnt he just start to liking Koharu for all her effort before all this mess? Tho now, i dont want Koharu with the likes of him. Shes deserves better.