I truly believe that at any point in time you can completely change your life. You can go out and get a different job that will bring different friends and a different environment.
You can let go of someone who meant the world to you because you decide that your world is better with out them in it... and everything changes.
If you dwell in a negative space your world will only get darker and darker. If your life with someone seemed so small and felt like it completely opened up when you let them go -- I find that to be a clear sign that you are on the right path.
I'm struggling currently with keeping the light in my life. I need to see the positive in every situation. I believe I am well on my way, but there is a lot of work to be done. Personal growth is the richest kind- I am thankful for the opportunity to grow and learn in this life.