我的心狠狠碎过却不会忘
[wŏ de xīn hĕn hĕn suì guò què bù huì wàng]
It reflects an unforgettable memory left after going through pain, heartbreak or trauma in some form or another. It speaks volumes about an emotionally intense experience that deeply influenced them but cannot simply erase these emotions or the incident itself despite it being very difficult to remember.