There are tears in the sea, and the blue fields breathe their jade to the sun. What does it mean for my ex-girlfriend to send me such a short message?

I think ... what she wanted to say was the last two sentences-"and a moment that should have lasted forever came and gone before I knew it."

This means that she is sorry for her lost relationship.

As an "ex-girlfriend", this sentence is too straightforward, so I gave you the first two sentences: "Mermaids shed pearl-like tears in the green sea next month, and the blue fields breathe their jade in the sun." These two sentences alone can't express any practical significance, but they are neat and beautiful.

If we have to investigate, this poem by Li Shangyin was written in his later years, which is his recollection of the past and his understanding of the bumpy life. Implicitly and euphemistically expressed his bumpy fate and sad feelings, lamenting the passing of the New Year and the emptiness of his ambition (he was trapped in the struggle of cronies all his life and could not display his ambition). But it has nothing to do with what your ex-girlfriend is trying to convey. ...