Manifesting people’s negative behavior?

I only recently learned about LOA and Neville. Growing up I had a very toxic relationship with a narcissist that manipulated and gaslit me. So much of what I’ve been learning is about how we truly create everything with our beliefs, thoughts, even if we don’t intend to. I have seen how I can create any reality I desire in the present and future. But how do I make sense of things I experienced in the past?

Please no “you did not create that” answers. It’s been a decade and I’m not looking for reassurance. I’ve seen the law is real and that was create all things with our thoughts. So I’m looking for real answers. Did I manifest that because I had a belief that I deserved that, or that people couldn’t be trusted?

The main reason I’m asking is because Ive been in love with someone that looking back has exhibited traits of narcissism and I’m wondering if that’s “changeable” and just a belief I need to look at? Believing that it’s set in stone seems against everything I’ve learned about LOA.

Has anyone had experience changing negative behaviors?