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.
When have you ever given up?
Wann hast du jemals aufgegeben?
¿Cuándo te has rendido?
¿Cuándo te has rendido?
Qui s’est incliné ? Quand ?
E quando foi que você desistiu?