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.
Just stop causing problems 
for other people.
Hör einfach damit auf,
anderen Leuten Probleme zu bereiten.
Solo deja de causarle problemas a los demás.
Solo deja de causarle problemas a los demás.
Quoi qu’il en soit, ne cause plus 
d’ennuis à ton entourage, compris ?
Pare de uma vez de causar 
problemas para os outros.