Girls, Why do girls keep numbers in their phone, knowing they won't text back?

I have a friend who would text this girl, but she would never respond. (Happens to all guys)

I was hanging out with her one time and we were talking about him. And she said that he would text her sometimes, like they were actually talking (but knew what it really was).

I didn't say anything about it, but I was thinking "why does she still have his number?". Personally, if I don't want to or ever plan on talking to somebody again I just delete their number.

Ladies, help me solve this puzzle!
Updates:
+1 y
I feel like it's partially to boost your confidence
Girls, Why do girls keep numbers in their phone, knowing they won't text back?
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