Why is it so easy for some girls just to move on?

Anonymous
I was only with my ex for a few months when we broke up, because he left me for his ex, it really hurt. It has been 3 days since we last contacted each other and I am starting to miss him. But I have decided not to contact him again and to move on.

Just yesterday a friend of mine was dumped by her boyfriend and she was "heart broken" (crying and stuff) and then today she has her sights set on a new guy. How come it is so easy for some girls just to move on to the next guy? In some way I wish I was more like that.
Why is it so easy for some girls just to move on?
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