Actually your husband is incorrect. Your marriage ended the day he filed divorce papers. I don't know what state you are in but in MOST states the day the dissolution is filed is the day the marriage had ended in the eyes of the law. You are now in the dissolution stage which is merely a set of legalities.

Why would you not be comfortable setting boundaries and leaving him to his own devices with the children? Hell, I would put on a dress that is divine, sky high heels and strut my ass out of the house while he is remanded to playing 'dad'. Make him wonder (and drool).