原谅我不是她
[yuán liàng wŏ bù shì tā]
Translates directly as 'Forgive me for not being her.' Suggesting regret or longing. It can imply feelings of inadequacy compared to another individual or past partner that have caused them emotional suffering or loss, which they wish others (especially a loved one) would understand and forgive them for what they're not able to provide like another special one did