Hi Allranuthin,
Welcome and hello

Thanks for telling your story. It has to be heart-wrenching to remove her belongings and wonder where she is at emotionally. It does seem there are many similarities with CPTSD and BPD. If I were given a choice, and struggled with these issues, I have to admit I would prefer a CPTSD diagnosis because it is far less stigmatizing.
People with BPD struggle with a lot of self-loathing and shame, and having a diagnosis like BPD can be especially challenging. They both struggle to maintain an inner equilibrium or what I once heard referred to as the black hole of trauma, or the failure of time to heal all wounds.
You mention that she began to project her FOO issues on you. It sounds like she was moving closer, becoming more intimate, and then that abruptly stopped and she pulled away with rage and vengeance. Perhaps she felt too engulfed as things became more intimate? That might explain the "you are controlling, you stole my identity" part.
When you have arguments or fights in the past, how did the two of you manage them? Who reached out first?