Why do Women delete Phone Numbers?

I don't understand why some women would go out with a guy, break things off and say they want to remind friends, act on that whenever they see the guy in person, but then have their phone numbers deleted. I know a girl who did this and when I asked her why, she just shrugged her shoulders and didn't give me an answer.

So why do Women do this?
Why do Women delete Phone Numbers?
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