To be rejected by someone doesn't mean you should also reject yourself or that you should think of yourself as a lesser person. It doesn't mean that nobody will ever love you anymore. Remember that only ONE person has rejected you at the moment, and it only hurt so much because to you, that person's opinion symbolized the opinion of the whole world, of God.
We cannot love a person with an all accepting, transcending and encompassing love without being hurt somewhat, without being disappointed, without being failed of our expectations. We cannot love without being broken, yet we cannot continue in love without being stronger than our brokenness.