Why give me your number when you aren't interested in the end...

Fox0507
So this happened to me twice. I have asked a woman for her number which she gives me to only find out that she doesn't respond when I contact her... I just don't get it? Why give me your number when in the end you really aren't that interested... My most recent case, I would like to think she was interested in me because she actually made sure that her number was correct by taking me phone and putting her number in it herself... But since then I really haven't heard from her... I mean I've of course initiated or tried to initiate a conversation since she gave me her number... And I've played it smart I haven't come off too eager or needy... I even waited a day until I contacted her... In fact she really doesn't even know me to even have an opinion about me, at least about my character... Seriously, I don't understand how you can give me your number, act interested and then later change your mind so to speak... Seriously can any lady out there explain this...?
Updates
+1 y
I guess another question to add to this one is, is there a way to prevent this from happening again. Like I said this has happened to me twice. I mean is there a way to sense that even if a woman comes off interested, it's most likely she really is not. I just want to emphasize that when I ask for these women's numbers it's after we've talk for awhile at whatever venue we were at.
Why give me your number when you aren't interested in the end...
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