It could be that he realized he was getting close to you, maybe loosening his boundaries too much, then was like, "Uh-oh, better pull back," and tightened his boundaries, but went a bit too far in the tightening. I've had that happen on a smaller scale (no yelling--I couldn't deal with that!) with both my T and marriage counselor. I called my T on it a few months ago, and she actually admitted (which is surprising for her) that she was feeling too close and thought she may have been losing her objectivity and wasn't helping me as much. So she was trying to step back. I feel like she's pulled way back since then, which kinda sucks. MC essentially admitted it (that he'd offered me more than he should have and made a mistake in doing that) the one time a year ago when we had a rupture. But we've gotten closer again (with a few steps back and forward in between).

I assume you've tried talking to him about it? I know you're pretty attached to this T, but might want to consider someone else. Or at least taking a break and trying someone else for a bit.