This is really sad. While it's valid and understandable to not always be able to hold space for that kind of a conversation or story, at a minimum there are far kinder ways to communicate that than for your partner to just say you're trauma dumping and leave you feeling like this is stuff you should never talk about. A good partner cares enough to listen to those things, and when they ask you not to share, it's more of a, "not right now, let's talk about this later."
I'm not trying to draw any conclusions because there's no way I'd have enough information anyway, but survivors of abusive upbringings are more likely to end up in abusive relationships because so much of that has been normalized (among other reasons). If your partner really accuses you of trauma dumping, that's a bit of a red flag to me and it might not be a terrible idea to talk to friends, family, or a therapist as a sanity check to see if it's nothing or if it's a pattern of how you are treated. If you don't want to do that, journaling can also help a lot with organizing your thoughts and feelings, plus it gives you a record of things in case you forget, downplay them, or are told otherwise and start to doubt yourself.
I really just hope everything is okay though. Stay safe out there, stranger.
Look up DoctorRamani on YouTube. Her videos were informative and validating when I was trying to escape my abusive narcissist ex. I also found journaling to help. I put all my thoughts and feelings about the relationship down in a journaling app, which helped clarify my thoughts, work through the emotions, and it served as a record against her attempts at gaslighting. I could also go back and refresh my memory, and I was surprised how deeply unhappy I was all the time. I knew there were problems and that I was struggling while trying to get her to be better, but I had this general sense that things were kind of okay. They were not, and it was really clear when I read it back.
Best of luck to you getting and maintaining as much distance as you can. It's hard now, but you will heal. Once the effect of the abuse starts to wear off, it'll get a lot easier.