YOU SAID:

I don't understand how she could leave me.

INTO JAPANESE

どうやって彼女が私から離れることができたのか理解できません。

BACK INTO ENGLISH

I don't understand how she managed to leave me.

INTO JAPANESE

どうやって彼女が私から離れたのか理解できません。

BACK INTO ENGLISH

I don't understand how she left me.

INTO JAPANESE

彼女がどのように私を離れたのか理解できません。

BACK INTO ENGLISH

I don't understand how she left me.