This old anonymous poem is well-known. Many artists have written songs based on the poem. But to this day, many don't fully realize the absolute tragedy told in the poetic story.
Two short lines say it all:
"And your maidenhead still
Is your pillar of light."
His childhood sweetheart died a virgin.
I decided to provide a reason as a short script. A monk took vows instead of marrying his love. After she dies, he grieves and deals with regret in the rain.