Why would an ex make fun of you online if the relationship ended a long time ago?

Say if a relationship ended a long time ago, but then your ex kept tabs on you online using fake accounts. Then they found a way to contact me and say that I’m still “infatuated” with him looking at my social media postings and claiming that it is obvious I still think about him and that it is funny. I don't know if he was the one wrote or if he asked someone else to do it since it was phrased from a second person’s perspective. Since these messages came he stopped viewing my social media. It has been about 2 weeks. What’s his problem? I never kept in touch with any ex did this long and this one seems a little nasty.

Why would an ex make fun of you online if the relationship ended a long time ago?
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