カズちゃん、さっき完膚無きまでに振っちゃおうとしたでしょ？
You were about to dump her flat out, weren't you?

会社をクビにならなきゃいいけどね。
I hope I can hold on to my job.

彼女を家まで送らなきゃ。
You've got to see her home.

こうして武田の悲鳴で通りすがりの船に気付いてもらえ、事なきをえました。
In this way a passing boat noticed them, thanks to Takeda's scream, and they survived without incident.

君はもう大人なんだから、もっと分別がなくてはいけない。
Now that you are grown-up, you ought to know better.

すぐに手紙をかかなきゃいけないよ。
You've got to write to him quickly.