If life is just like the first sight, what does it mean?

If life is just like the first time, what is hentai's autumn painting fan? —— From Mulan Ci, A Friend of Cambodia, written by Nalan Xingde in Qing Dynasty. Meaning:

Getting along with the right person should always be as sweet, warm, affectionate and happy as when we first met. But you and I were supposed to love each other, but why did we leave each other today?

"Sad Painting Fan in Autumn Wind": Borrowing the story of Ban Jieyu in Han Dynasty. Ban Jieyu was once the concubine of Emperor Han Cheng, but she was jealous and greedy by Zhao Feiyan, so she was put in the cold. Liu Xiaoluo of Liang in the Southern and Northern Dynasties once wrote "Ban Jieyu's Complaints": "My body is like an autumn fan", so she used autumn fans as a metaphor for abandoned women.