Why does my exes former girlfriend (the woman he dated after me) still hate me and post bad stuff about me online 6 years later?

So long story short I had dated a guy who was a cheater and liar 6 years ago…. he cheated on me with the woman he ended up making his next girlfriend and she was always hating on me and accusing me of going after her man to the point where she would write false statuses online about me and spread lies about me….

she dumped my ex /her ex and now she has a new guy that she moved on with and I myself moved on a long time ago as well….

so if she’s with a new guy now and saw what an asshole our ex was, then why does she still hate me and look for negative stuff to spread about me? Is she psycho?

Jealous/ blames me for breakup
Didn’t move on from the ex boyfriend
All of the above /she’s out for revenge
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Why does my exes former girlfriend (the woman he dated after me) still hate me and post bad stuff about me online 6 years later?
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