YOU SAID:

I've been cheated by you since I don't know when

INTO JAPANESE

いつ私が知らないので、私はあなたに騙された

BACK INTO ENGLISH

When I do not know, I was deceived by you

INTO JAPANESE

私が知らないと、私はあなたに騙された

BACK INTO ENGLISH

If I do not know, I was deceived by you

INTO JAPANESE

私が知らないなら、私はあなたに騙された

BACK INTO ENGLISH

If I do not know, I was deceived by you