Because there is nothing here than invites us to cherish unhappy lovers. Nothing is more vain than to die for love. What we ought to do is live.
Some cry: 'Love me!!' Others: 'Don't love me!!' But a certain genus, the worst and most unhappy, cries: 'Don't love me and be faithful to me!!'
It is not humiliating to be unhappy. Physical suffering is sometimes humiliating, but the suffering of being cannot be, it is life.