When the student goes to the Prince's ball with the red rose that he finally "finds", he is shun by the girl. The flower does not go with her dress, she says. And she would have preferred jewels, instead of flowers. Plus, the student is a nobody in her eyes. Why even bother looking his way?
Here we see the difference between the bachelor and the nightingale: to the bird, love is more important than anything. The love that the nightingale bares for the student and for her idea of love is overwhelming. She gives it all to him, out of that deep sentiment that she has cultivated. She also believes in what she does. Those who believe see no sacrifice.
Meanwhile, unaware of the huge sacrifice that has been done for him, the bachelor simply says:
"What I a silly thing Love is," said the Student as he walked away.
"It is not half as useful as Logic, for it does not prove anything, and it is always telling one of things that are not going to happen, and making one believe things that are not true. In fact, it is quite unpractical, and, as in this age to be practical is everything, I shall go back to Philosophy and study Metaphysics
Therefore, although all of us think that we have loved, very few have loved truly and stopping at nothing. Love has many levels, but only those who have reached its cuspid can actually tells us what it really is.