Why do many people marry the opposite of who they dated in the past?

Like if a dudes running around with chicks who are partying, sleeping around, getting blackout drunk, and the list goes on. To later marry a very sweet loving woman.

A woman may be running around dating bad boys, players, and the list goes on. But she settled down with a gentleman.

The marriages hardly ever last though. Many times they pick someone who doesn’t know their past dating history.

Why do many people marry the opposite of who they dated in the past?
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