YOU SAID:

I hate that you have a girlfriend and she isn't Me.

INTO JAPANESE

あなたにガールフレンドがいるのに、彼女が私ではないことが嫌いです。

BACK INTO ENGLISH

I hate that you have a girlfriend and she's not me.

INTO JAPANESE

あなたにガールフレンドがいるのに、彼女が私ではないなんて嫌です。

BACK INTO ENGLISH

I hate that you have a girlfriend and she's not me.