As soon as I read your post I thought of the parent child relationship. You see parents in the shops yelling at their children sometimes when the child acts out. You see them getting angry back at them. Sometimes you see parents in despair. Does that indicate that they care about the child? I'm not saying they don't care about the child but why is having a big response to a child acting out the only way to show caring. I think your therapist was holding your anger. Allowing it to be. Allowing you to express what is (apparently) a normal emotion. (I have serious issues with feeling and expressing anger) . I think him not being hurt by it shows more caring than blaming you. I think him not letting his feelings into the space is more caring than making it all about him. Just a thought.