Why do girls forget compliments and remember insults?

Anonymous
Why is it that a compliment seems to have a radioactive half-life of 24 hours? If I tell a girl she's beautiful 1000 times, she will have forgotten all of them in a week.

But if I tell her she's fat just *once*, she will remember it 20 years later?

Why is this?
Why do girls forget compliments and remember insults?
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