YOU SAID:
Then why!? Why didn't you stay?!
INTO JAPANESE
それでなんで!?なんで泊まらなかったの?
BACK INTO ENGLISH
So why! ?? Why didn't you stay?
INTO JAPANESE
なぜ! ??なぜ滞在しなかったのですか?
BACK INTO ENGLISH
why! ?? Why didn't you stay?
INTO JAPANESE
どうして! ??なぜ滞在しなかったのですか?
BACK INTO ENGLISH
why! ?? Why didn't you stay?
That didn't even make that much sense in English.