Cali did a very nice job of explaining co-parenting w/a MLCer and also showing them the "error of their ways".

I would continue as you have been and when he moves out, he'll quickly learn that it's not as easy as he thought it would be.

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.