Why is this ex friend still trying to contact me years later?

I was friends with this girl, and she became a toxic friend in many ways, so I decided to cut myself off from contact for my own sanity

The reason I decided this was because she was always angry and snapping at me, and it became very unpredictable and I often felt like I’d be walking on eggshells. She also said things to hurt and upset me, for instance when we both bumped into my ex, she would tell me he didn’t even acknowledge my presence when I walked past him. She also pointed out to me on a separate occasion when we met my ex’s friends that they ‘completely ignored me and acted like they hated me’

When we were both invited to a wedding, she tried to separate me and stopped me from talking to anyone except her, and embarrassed me in front of the guy I fancied by inviting the guy I liked over to hers for champagne in front of me. She also kept coming out with remarks such as ‘I look like a troll compared to you in photos’ and she kept wanting us to take photos together and kept asking me to stand in a corner so she could take my photo.

I found the only way was to block her number. She then called me on two different numbers after I had blocked her and sent me a voicemail asking me to get in touch with her. After I didn’t get back in touch she showed up one evening at my social group. The entire night, she was glaring at me as if she wanted to hurt me. And she made a passive aggressive comment about how she wished friends ‘had her back’

four years later she finds me on social media and sent me a private message, which was aggressive saying ‘I’ve tried to contact you but I’ve not heard so I’m going to stop now, have a good life’. After this, a month later she starts sending me other messages, copying links of videos I would like and sending nice messages to me. She’s now tried to send emails to me, has called me on social media about ten times years on

Why is she contacting me four years after I cut her off and stopped speaking to her?
Why is this ex friend still trying to contact me years later?
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