Why would an ex message & try to annoy you when you’re moving on?

They have a new partner and so I’ve completely left them to it. So why on earth are they still responding to my posts on social media trying to annoy me? Like I couldn’t care less dude, you made your bed so go and sleep in it. And leave to live mine.

Why would an ex message & try to annoy you when you’re moving on?
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