What is my Next Move?

[Oxford1]

So there is a meeting on June 2 about my son16 at his school.
It's on his needs etc.
The wife said she wants to call in on a conference call or have me text her what any issues are

I told her NO

If he means that much to you then you should be there in person.
She went off that I was manipulative that I don't care
That if I move out or kick her out it is me who does not care about him etc etc

Why am I in the wrong but her flaunting her affair has no affect in him according to her and what she says her IC says!