YOU SAID:

Why don't you say so, didn't even notice

INTO JAPANESE

なんでそんなこと言わないのに気づかなかったの

BACK INTO ENGLISH

I didn't notice why I didn't say that

INTO JAPANESE

なぜそう言わなかったのか気づかなかった

BACK INTO ENGLISH

I didn't realize why I didn't say that

INTO JAPANESE

なぜそう言わなかったのか分からなかった

BACK INTO ENGLISH

I didn't know why I didn't say that

INTO JAPANESE

そんなこと言ってないよ

BACK INTO ENGLISH

I didn't-I didn't say that.

INTO JAPANESE

そんなこと言ってないよ

BACK INTO ENGLISH

I didn't-I didn't say that.