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 are an idiot. 
So don't try to tell me how I feel!
Du bist ein Idiot. 
Also sag mir nicht, wie ich fühle!
¡Eres un idiota! ¡Así que no 
intentes decirme cómo debo sentirme!
¡Eres un idiota! ¡Así que no 
intentes decirme cómo debo sentirme!
Dans ce cas, ne nie pas 
mes sentiments, imbécile !
Você é um idiota, então não fique
achando que sabe como eu me sinto!