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.
Didn't you say you 
weren't going to look?
Meintest du nicht, du würdest nicht schauen?
¿No dijiste que no ibas a espiar?
¿No has dicho que no pensabas fisgonear?
Tu n’avais pas dit 
que tu ne lirais pas ?
Você não disse que não ia olhar?