Why do men love long hair on women?

It doesn't seem to matter whether the long hair looks good (or is even healthy or shiny). Why is long hair on a woman so important to guys?
Update: To the person who suggests that I got the wrong info: this actually happened to me! I recently cut 6 inches of hair off and the guy I've been seeing for 6 months almost had a heart attack, and tried to make me promise not to cut it again. I told him he was insane and to take a hike!
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