It's possible she wasn't lying, it's possible you've misinterpreted her body language - you talk about her being triggered and then go on to describe what others here have noted as discomfort. I know when I'm triggered nothing will stop that showing, because the very nature of being triggered is that you don't have control over your response so if she was triggered, her sitting with a client wouldn't have changed her reaction much, I very much doubt she would have been able to dial it back to "mild discomfort".
I wonder if it's worth thinking about what makes it so important to you that people here agree with you, and that your sex life is something that triggers your T, that it's something she isn't able to hold. And I guess the final part of that, if there really was something in what you said that was triggering for her, it doesn't make her incompetent or shit at her job, it just means she has limits and you worked beyond them. It may be that this reaction is new for her and she is simply unaware of it, because it hasn't happened before, she could be bewildered by you saying she's avoiding because she's never been uncomfortable about sex before. There's a reason Ts should have regular supervision and their own therapy, because things come up that they aren't aware of in exactly the same way that clients have blindspots.
By leaving, you've deprived yourself of the opportunity to work through it with, that might have been enriching for you. I wonder if you can see a pattern that mirrors what's happening with your T. You say "you're uncomfortable", she says "no, I'm ok with this" you go on to argue that she is, and that you want her to get to where she admits that your view of her is correct. You say here that your T is incompetent, triggered etc, folk here say "maybe, but there are other possible explanations", you say no there aren't and continue to argue, folk here say "what your saying could be happening, but there are other possibilities", you say no there aren't and go on to tell us the kind of responses you would have engaged with, which start with the premise you're right about your T.
Exploring if that pattern creeps up in daily life would been therapy material.
