Haruki hears about Kazusa's moving from her mother, who she hadn't been on good terms with.  He feels betrayed and angrily confronts her.  But his words force open the door to Kazusa's heart, which she had desperately tried to keep closed so that the three of them could stay together.
You're the one who disappeared from my sight.
Du bist derjenige, der aus 
meiner Reichweite verschwunden ist.
Tú eres el que me dejó atrás.
Fuiste tú quien me dejó atrás.
C’est pourtant toi 
qui t’es éloigné de moi en premier.
Foi você quem me deixou para trás.