I've gone from weekly to every two weeks in the past in order to save money. It can be a reasonable thing to do, but in your case it doesn't sound like the best move given what you've said about trust, trauma, and spiraling.

It didn't work especially well in my case either--I've found I really don't move forward in therapy at all if it's less frequent than weekly. And while at the time I justified the switch because of money, in hindsight I definitely could have afforded it if I'd wanted to--under the surface the issue was much more about being unsure if therapy was worth the cost in general, and having major doubts about whether it was helping me. That's not to say someone else couldn't legitimately only have finances in mind in cutting back on sessions, but for me there was definitely something else going on too. For better or for worse those past therapists didn't pick up on that possibility at the time, we didn't talk about it, and we didn't discuss the underlying feelings of doubt I had about therapy until they'd gotten much bigger and I'd decided to terminate. So my advice would definitely be to discuss this with your therapist and see what comes up.