YOU SAID:

It took him a while to realize that everything he decided not to change, he was actually choosing

INTO JAPANESE

彼が変更しないことに決めたすべてが実際に選択していたことに気付くのにしばらく時間がかかりました

BACK INTO ENGLISH

It took me a while to realize that everything he decided not to change was actually the choice

INTO JAPANESE

彼が変えないと決めたものはすべて実際に選択されたものだと気付くのに少し時間がかかりました

BACK INTO ENGLISH

It took me a while to realize that everything he decided not to change was actually the choice