I am still standing with my daughters

[Davide]

Sorry to hear that this is turning adversarial, Sia.

Why is he making this further harder and more expensive for both of us?

It sounds like he is going this direction because you didn't roll over and acquiesce to his unreasonable demands in mediation. He didn't get exactly what he wanted so he is going to take it out on you.

Remember what your boundaries are. You can only control yourself and your reactions not him. For him to propose that you move across the country was unreasonable and you rightly denied that. If his reaction is to go to Ls and make this more costly and painful there isn't much you can do other than to protect yourself and your kids. Definitely talk to your L and give him the L's information.

He has already missed his schedule time twice in 2 months, not sure how he is planning to keep his end of childcare while maintaining a long distance R with OW

Keep track of the dates that he missed. That could be helpful information for you.

He probably thinks I am controlling him again by not moving. He is having to choose between kids and OW and blames me for it, his reasoning part of the brain is dead.

That is his problem. If he wants to move he can, but he can't force you to. Don't take on his problems.