YOU SAID:

never really knowing why

INTO JAPANESE

本当に理由を知らない

BACK INTO ENGLISH

I really don't know why.

INTO JAPANESE

- 知らないわ、本当に知らないの

BACK INTO ENGLISH

- I don't know. I really don't know.

INTO JAPANESE

- 分からない私は本当に知らない。

BACK INTO ENGLISH

- I don't really know.

INTO JAPANESE

-本当に分からないの

BACK INTO ENGLISH

- I don't really know.