Why do guys try to keep their options open this way?

Caramalkisses23
I have a friend who's been dating this girl, but still thinks he needs to keep his options open just in case it doesn't work out. I don't understand this. If he likes the girl he's dating, why does he need to keep searching for other girls? I know when I start to date someone there is no way I'm going to be searching for other guys. In my opinion, that's how you lose someone good.
Why do guys try to keep their options open this way?
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