The mistake many of us make is to expect someone to come into our lives and make us happy. The key to happiness is to realize that no owes us any obligation to make us happy. We must take control over our lives and do not rely too heavily on someone else for happiness. Often after a breakup people hold on to the hurt and pain of the failed relationship. Unhappiness becomes a way of life and there is no moving forward.
We have to understand that people will disappoint us, they will betray and hurt us. But we must refuse to let them take our joy. Promise yourself that you will choose happiness in spite of situations that are beyond your control. Trust God and know that he will not allow the person who cause you pain to live happily ever after while you live in misery.