If someone told you they no longer wanted to be with you , why would they still harass you?

They clearly told you it’s over and they no longer want to be with you , and you said ok and walked the other way , But they continue to harass you won’t leave you alone? Why would they do that if they clearly don’t want to be with you anymore?
If someone told you they no longer wanted to be with you , why would they still harass you?
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