YOU SAID:
when I looked at you, I fell in love, and you smiled, because you knew
INTO JAPANESE
あなたを見たとき、私は恋に落ちました、そしてあなたは微笑んだ、なぜならあなたは知っていたからです
BACK INTO ENGLISH
When I saw you I fell in love and you smiled because you knew
INTO JAPANESE
あなたを見たとき、私は恋に落ちました、そしてあなたは知っていたので微笑んだのです
BACK INTO ENGLISH
When I saw you I fell in love and you smiled because you knew
That didn't even make that much sense in English.