YOU SAID:

What's up? I haven't seen you in a while.

INTO JAPANESE

どうしたの？私はしばらくあなたを見ていない。

BACK INTO ENGLISH

What's wrong? I have not seen you for a while.

INTO JAPANESE

どうしましたか？私はしばらくあなたを見ていない。

BACK INTO ENGLISH

What's wrong? I have not seen you for a while.