YOU SAID:

i like this boy and he likes me back but he doesnt know that i know

INTO JAPANESE

私はこの少年が好きで、彼は私のことを気に入っていますが、彼は私が知っていることを知りません

BACK INTO ENGLISH

I like this boy and he likes me but he doesn't know what i know

INTO JAPANESE

私はこの少年が好きで、彼は私が好きですが、彼は私が知っていることを知りません

BACK INTO ENGLISH

I like this boy and he likes me but he doesn't know what i know