YOU SAID:
He loved her for the rest of his life, but he could never tell her.
INTO JAPANESE
彼は生涯彼女を愛していましたが、彼女にそれを伝えることができませんでした。
BACK INTO ENGLISH
He loved her all his life, but couldn't tell her.
INTO JAPANESE
彼は生涯彼女を愛していましたが、彼女にそれを伝えることができませんでした。
BACK INTO ENGLISH
He loved her all his life, but couldn't tell her.
That didn't even make that much sense in English.