What kind of feelings does the rain scene in Zhu Xiang express, and how is it expressed?

The beginning is always sweet.

Then there is boredom, habit, abandonment, loneliness, despair and sneer.

I once longed to be with someone for a long time. Later, how glad I was that I left?

Once upon a time, for a short time, we thought we loved someone deeply.

Later we learned that it wasn't love, it was just lying to ourselves.

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