Continue to question and be skeptical of your fears and beliefs.
Most of the pain you are experiencing now or envisioning experiencing in the future are based in these fear based beliefs that you have developed since childhood.
Challenge them and as you slowly (dreadfully slowly sometimes :)) peel the layers back the truth will begin to surface and you will be able to consciously choose what to believe in and how you wish to live your life.
I was totally co-dependent on my stbx and based my happiness and self worth in our relationship.
Its an exhausting life to live when you have to try to control other people in your life in order for you to feel a certain way.
Much more peaceful when you can provide for yourself and love yourself from within.