Why delete someone's number?

I have been trying to figure out for a long time now why it is that guys will delete my phone number. They'll do it after a fight even though I never tried to contact them. Also, having my number in their phone wouldn't stop me from calling or texting them anyway! Same with Facebook; why delete me as a friend? I don't understand.

I personally only delete phone numbers out of fear of "drunk calling/texting" because I have a habit of doing it to my exes. And I would only delete a Facebook friend if they've been harassing. After evaluating my reasoning, there is no possible way that their reasoning for doing so would be the same.
Why delete someone's number?
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