The stronger he senses you are becoming, I suspect the harder he will push. I am an optimist and believe this HAS to come back and bite him in the butt in multiple ways. But whatever happens, the best part is the stronger you get, the more you reinforce these boundaries, the more your girls see an example of what a parent should be. I know you are shaken, and I don't blame you one bit, but I also hope you are proud of yourself, because I am.
Sending you lots of positive vibes and strength this week. Bless that trooper for supporting you.