This is just my opinion, of course, but I think the best type of therapy for you would be individual therapy with someone who understands addictions and codependency,and is open-minded about recovery pathways.
Such a person can help you sort out your feelings and values, and help you figure out the best way forward for you and even help determine whether couples counseling would be helpful. (I would not START with couples counseling, I think you need someone whose focus is just on you--not because you are "the crazy one" but because you are in a terrible situation and have decisions to make.)