What is the interpretation of the poem Pipa Xing Li Yin?

This is a very beautiful poem, which expresses the sadness in the poet's heart.

A farewell song with nothing to say.

Cold stars disappear, and blue light breaks lonely hearts.

When the peach blossoms first opened, I began to play the pipa.

A faint sadness surrounds the lingering fragrance.

But I am willing to pay 1000 dollars for my heart. Who knows the tears in the beauty song?

It is difficult to dance solo, but the sound of staying in spring is long.

Plain hand, green silk, Hosta, hidden flowers

Cold rain, sadness, candle tears, a thousand lines

The leaves of the buttonwood tree fell down and the curtains rolled up.

This poem expresses the poet's sadness at seeing his old friend leave.