I'm so sorry that your therapist is doing this (and then denying that he is). It sounds so painful.

My therapist has said that he'd never terminate me unless I did something really extreme (like, the only client he's terminated physically threatened him to the point that he called 911). But I told him he could change rules, like no longer allow email, or become much colder (he's not the warmest to begin with) that would change the therapy and make me want to leave. And he said I had a really good point there, like I don't think he'd thought of it that way before.

With my former marriage counselor, he was very accepting of everything that I said or did until he very suddenly wasn't and was quite harsh to me about something. I've wondered before if he was just tired of me (well, us, but I doubt he was tired of my H) and in part reacted that way, in a very rejecting way, plus saying I had to reduce contact, because he suspected it would make me leave. I/we ultimately did, but we tried to make it work for a few months.

It does seem like you probably need to find a new therapist. This may not actually be about you or at least not about his trying to get you to leave, but it just seems that he's really hurting you right now. If he was taking ownership of things that hurt you and/or apologizing and trying to work through it/make it up to you, it would be different. But it doesn't seem like he's doing that. I'm sorry.