Dear Liz, do you think that fear of loss of many of the benefits of the current lifestyle could be a factor that is keeping you "stuck" (your word). Such things as financial security, beautiful home, attractive husband, social status. I do think that the fear of not being being able to duplicate these things as a single parent is a large factor with many people. I know before my divorce I had to make plans for "survival" alone. For me, it turned out that the big house and social standing was a small price to pay for peace-of-mind.
I second every word in LaTeeDa's post about awareness---acceptance----action. Acceptance that you are powerless to change him. In my experience these words are truth.
compassionately, dandylion