Buchio realizes that the source of his fear is loneliness, and learns the importance of living in the here and now. Jiro reveals the sad memories he's kept locked up inside in his efforts to avoid worrying Mutsumi.
I'm pretty sure that's 
because you're lonely.
.واثق أنّ سبب ذلك هو وحدتك
Sicherlich, weil du dich einsam fühlst.
Creo que eso es porque te sientes solo.
Creo que eso es porque te sientes solo.
C’est sûrement parce que
tu éprouves de la solitude.
Molto probabilmente
è perché ti senti solo.
Você deve estar sentindo isso,
porque se sente sozinho.
Думаю, что причина этому —
чувство одиночества.