Ohh I see whats going on. Okay Chizuru could either have had been in an arranged marriage for awhile and that time before the flower toss was her showing she actually wanted some real romance ORRRR it could be, she's just as pathetic as the MC confused about her love for him, she instead went out with another guy instead of just confronting Rin herself. Just like Rin going for Takako.
Speaking of Takako she mellowed out eh? But What in the goddamn?! Takako must have some kind of Ulterior motive here. maybe revenge play?