Most Helpful Guy
They either want them back or they just want to validate themselves by getting that attention back. When someone is unexpectedly dumped they very often take a big hit to their ego and only the person who has done the damage can patch it back up, or at least that's how it feels.
If, however, it is the dumper seemingly trying to make the dumped ex jealous then it could be vindictiveness or it could actually be nothing more than the dumped person's perception. Dumped people often watch the actions of their ex and think that everything the ex is doing is about them or for their attention when it isn't.
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Most Helpful Girl
They don't feel loved