Learning from the choices you make.
I guess part of appreciating what you have now is dependent on what you had before. Learning from the heartaches and bad choices of the past and moving forward while trying your level best not to repeat those mistakes in your present or future. Looking back on my life, I am a lucky woman to have met so many wonderful people and to have loved and been loved by a few. I also learned from the ones that I hated and who hated me, so all in all, I guess it is okay to be happy now and to miss what might've been.