YOU SAID:

but what if i am unable to ever see him again?

INTO JAPANESE

しかし、二度と彼に会えなくなったらどうしますか？

BACK INTO ENGLISH

But what if you never see him again?

INTO JAPANESE

しかし、二度と彼に会わない場合はどうでしょうか。

BACK INTO ENGLISH

But what if you never see him again?