The love you had when you were young is like a moth flying into a flame. It is precisely because there is no way out that you can never look back.
During the six years he was with her, he loved her without hesitation and hated her to the core.
Four years later, they met again. He was entangled, but she was calm and composed: "Not all broken mirrors can be reunited, and not all old relationships can be unforgettable.
No matter how lingering, sentimental and unforgettable it is, it will never be able to withstand the passing of time and the end of the song.