Why would a guy continue to hang around me when I told him not to?

I got turned off by something he did but I didn't tell that since then I've been telling him not to hang around me and to leave me be but he still doesn't get it. Yesterday I got mad and told him to leave again.

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+1 y
*but I didn't tell him that why I got turned off and th e reason behind it
Why would a guy continue to hang around me when I told him not to?
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