Random Question on Love and Hurt

They say that only the people you love can hurt you. Now my question is would you hurt someone you love? Well if your answer is no then if someone hurts you then that person does not love you. Right? So why love someone who does not love you back and hurts you at the same time? Not only is it a waste of time but you might be losing the opportunity to love someone who loves you as you deserve to be loved and treat you like you are the most valuable person in this world.