If you have experienced unrequited love, as so many people do at least once in their lives, Dante's work is a pleasant stroll through the purity, nobility and delight of such love.
For me, at least, it taught the salutary lesson that although such a love can never be outwardly returned it will also never die. It's a commonly recurring conclusion in literature since but, as far as I can tell, Dante was the first person to write about it.
There's only one kind of love that lasts - unrequited love. It stays with you for ever.