Why are women so cold after they dump you?

I've seen this way too often and it just baffles me how you could be so intimate with someone and once that ends they can be so immediately cold and act like they never knew you. I know this can be true for both sexes, though I've seen this way more often in girls and oddly enough even when you're the one getting dumped by them.
Why are women so cold after they dump you?
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