WHY is red considered the color of love?

According to one version, love first became associated with the color red after the appearance of a popular 13th-century French poem called The Romance of the Rose. It tells of the hero's allegorical search for a red rose, which symbolized his beloved.

And later, in the 19th century, French and English writers created the language of flowers, according to which the red rose means love. Subsequently, it was no longer only the red rose that was associated with love, but also the color itself.