Your childhood insecurities and shame are keeping you and your children locked into a material world prison and your addict husband is the warden.
You may have grown up feeling shame about your home or your clothes or the college you couldn’t attend. How do you suppose your children are going to feel about you when they do discover their dad is an addict and their mom chose to stay for the material things?
Your codependency is similar to his addition with both of you in denial and staying stuck.
If you don’t have the courage to leave the material things behind for a more emotionally healthy life then find the courage to focus on you and your issues that are keeping you un-healthy.
Keep working with your therapist and like anvilhead said if this therapist isn’t helping get a new one.