此情已自成追忆死生契阔与子说
[cĭ qíng yĭ zì chéng zhuī yì sĭ shēng qì kuò yŭ zi shuō]
Translated literally it suggests past sentiments have transformed into sweet reminiscence. Regardless of separation through life and death, this love will always be confessed - a deep, long-term, undying feeling beyond life and death.