Hey CL, I dont think the threshold is the LBS being ready to leave the marriage as it is being able to feel that you will be ok if it ended and moving forward in your life as if the spouse is not coming back. I think there is a difference.
I, too, have issues regarding covert manipulation on my h's part. I struggle with trying to assert myself and my boundaries. I am realizing that no one should be allowed to let you feel powerless and that my part in this journey is to be able to gain the strength to not allow that to happen.
Keep moving forward in your life. Its great that you are so involved with dancing. Focus on that. I think as you feel more confident with yourself, you will be able to deal with your issues with your w in a whole new way.