YOU SAID:

OMG you can't be with him.

INTO JAPANESE

ああ、彼と一緒にいるのは無理だ。

BACK INTO ENGLISH

Oh, I can't stay with him.

INTO JAPANESE

ああ、彼と一緒にはいられない。

BACK INTO ENGLISH

Oh, I can't be with him.

INTO JAPANESE

ああ、彼とは一緒にいられない。

BACK INTO ENGLISH

Oh, I can't be with him.