Why are some woman are desperate to the point that when a guy not interested they come to a point it is harassment?

Can someone tell me what to do in this situation if I’m not interested in that person it like she thinks I love her or have feelings for her I don’t know what it is but I kindly rejected her because I wasn’t interested in her what do I do please someone tell me she claiming me and her was in a relationship but was kissing two different guys back in high school my homies caught her being a thot she saying she misses me but I don’t feel the same because you wouldn’t ghost a person for ten years right so why is she coming back if I don’t want her how do I tell her to stop please someone tell me what to do? Bro she ghost me ten years ago why should I have to give her a explanation on why I’m not attracted to her does that mean she desperate?

Why are some woman are desperate to the point that when a guy not interested they come to a point it is harassment?
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