Why does showing no emotions or acting like you don’t care make a girl want you (more in details)?

CAPTAIN-OBVIOUS
Two girls:

Girl 1: she broke up with me and I cried in front of her begging not to break up with me. She moved on from me and never came back to me.

Girl 2: she broke up with me and I acted like I didn’t care. I just told her “yeah, I understand and hope you have a good life. Thank you for the memories by the way.”
Girl 2 then came back trying to get me back after a couple of days. Deep down inside I felt really sad she was breaking up with me but I showed no emotions. I learned my lesson from the first girl.
Why does showing no emotions or acting like you don’t care make a girl want you (more in details)?
Why does showing no emotions or acting like you don’t care make a girl want you (more in details)?
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