But, I DO have secrets from him

He only knows the most GENERAL vague idea about my history.
I told him that it helps me to keep it contained in T's office. I don't like to speak it out here in the world, because then it is OUT HERE WITH ME. He understood, I think. And I have told him 2 tiny things before and he ended up using them both against me in heated moments ("you wouldn't be like this if (x) hadn't happened"). And he didn't say it nicely. So, it just doesn't feel safe. I can't have that stuff being thrown at me out of nowhere.
H isn't angry. But I feel horrible and stressed. I hate myself.