Oh, Atsbaby, I'm so sorry about tonight. It's one thing to talk about a betrayal with OW but another betrayal was his reading your journal. My H has done the same and part of his anger is because "of all the terrible things I said about him". Truth is, I use journaling to help me get it all out and work through it all. Of course he only read a "getting it all out" entry. It's still a violation of your privacy and shouldn't be glossed over. It just adds to your inability to trust him and for that I am sorry.
His "can't discuss it" statement is BS. No attorney would advise their client to not discuss marriage counseling. What a crock.
Hang in there. You're in the thick of it but I'm thinking about you. (((hugs)))