Why are some women so toxic?

Me and my ex have only been together for a year and not even a full year because we have always been on and off. You wouldn’t believe most of the stories I have to tell about the two of us. From cheating to verbal abuse, physical fights and more. We ended things for good recently, but she got on Facebook bashing me, calling me broke. Saying she’ll never get with me again. Telling everyone that she broke up with me when she knows it was mutual. Even after all of that, she has been blowing my phone up with texts begging me to have sex with her. As if she didn’t do what she did on Facebook. I literally had to block her. I don’t understand women like her. Do they just enjoy being confusing and enjoy playing games?
Why are some women so toxic?
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