YOU SAID:
Pretends he doesn't know that he's the reason why
INTO JAPANESE
彼がその理由であることを知らないふり
BACK INTO ENGLISH
Pretend not to know that he is the reason
INTO JAPANESE
彼がその理由であることを知らないふりをする
BACK INTO ENGLISH
Pretend not to know that he is the reason
Well done, yes, well done!