I'm sorry to read that your divorce hasn't taken place.
So, you've turned in all of your paperwork to the one attorney and nothing has been done since October? Don't ask your h again about it...call the attorney yourself and find out what is going on. For all you know, he's told her not to do anything w/the paperwork. Besides, why would he push for a divorce when he's got everything just the way he wants it? He's got you right where he wants you. He does love control and manipulation and if you were to divorce, that control would go away.
As for calling him up on weekends...now that you know that the ow is there, I wouldn't do so again. I would also treat him as a "just a friend" when he calls being so nice, etc., when she's gone. It's time to step back from him and detach even more. Only have conversations w/him about your son.
Do yourself a favor...call the attorney today to inquire about the status of your divorce. It's unacceptable that she hasn't been in contact w/you since October.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.