Why is it impossible for some women to have a healthy relationship with anyone?

I used to know this woman that due to her toxicity I had to end all contact with. 2 years later she's still obsessed with our former connection. I don't dislike her. I don't think she's a bad person deep down. But she very controlling and manipulative which is why I had to end all contact with her. But I don't get is why she's so obsessed with me? Is it the fact that I ended it? Or does she really feel in her twisted mind we had something?

Why is it impossible for some women to have a healthy relationship with anyone?
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