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.
I thought it was all in my head, 
and I just couldn't give up...
Ich dachte, ich hätte mir alles nur eingebildet,
 aber konnte einfach nicht aufgeben.
Pensé que era solo mi imaginación... 
que debería olvidarlo.
Pensé que era solo mi imaginación... 
que debía olvidarlo...
J’ai toujours cru 
que je me faisais des idées…
Que era coisa da minha minha cabeça...