Focusing your thoughts on a certain aspect makes it grow and become more prominent in your life. You become what your thoughts and your life is a result of your thoughts. It has nothing to do with what's happening around you. If your thoughts are still stuck on your past then that is where you will continue to live... in the past! If you focus on how sad and hurt you are, you will continue to be sad and hurt!
What you remove your attention from will eventually seize to exist in your life. Do daily mental and emotional clearing by making peace with yourself and also making peace with your past. The source of healing begins when you declare that you are ready to enter a new state in your life.