YOU SAID:
One time I knew you, now you mean nothing to me!
INTO JAPANESE
私はあなたを知っていた一度、今私に何の意味もありません!
BACK INTO ENGLISH
Once I knew you, now I have no meaning to me!
INTO JAPANESE
私はあなたを知った後、今私には意味がありません!
BACK INTO ENGLISH
After knowing you, now I have no meaning to me!
INTO JAPANESE
あなたを知った後、今私は私に意味がありません!
BACK INTO ENGLISH
After knowing you, now I have no meaning to me!
That didn't even make that much sense in English.