Why is it so hard to forget? Why is it hard to accept?

Even if you selfishly loved the wrong person, you gave everything, yet she will be unfair to you. Love is not fair. How can you ever find the right one? Who will it be? The right person who will right all your actions and let you feel that you are special. Most special person in this world. Who might it be? The one who will make you happy and will never let you feel that you do not belong inside her heart?