Sharing a video that you made is not defamation.

I am sorry this happened to you. You need a lawyer to sue him for divorce and support. Perhaps legal aid if you can't afford one.

Please see my prior to answer to your question.................

This Q&A forum is not a place to delve into complex legal issues like yours. You have a lawyer. Ask them.

I don't see this as a legal issue. I would strongly recommend counseling.

The same as you can bar someone from your home and not tell them why.

Illegal as in a crime? No. Sloppy and unprofessional? yes.

He is blowing hot air..................................................

Can the police issue a ticket in a school parking lot? Yes.

Nobody here can answer your question, and no one here has all the facts. And our opinion is not going to matter. You need to retain counsel.