The one I see asked if she could use something I wrote for a class she teaches. But she asked me about it before she used it. And she told me what she was doing it for - the purpose for which it would be used in the class. And she gave me time to think about it.
I would be quite upset at a therapist demanding my notes and attempting to use them without asking me if he could do so.
And you do not have to give him your notes if you don't want to do so. He has no right to them.