Why do some guys always want a girlfriend

I've realized that a lot more guys are always looking for a girlfriend. Then when they can't find one or have one they get really bummed and upset. They usually post it all the time over a social website or I hear them complaining about not being able to find a girlfriend such as " man, I'm just looking for a girl...why can't I find her". I never realized how hard it is for some guys to find girls. You would think that most guys would be able to find a girl or at least go do other things while waiting. But why do some guys make it seem like it's the end of the world if they don't have a girlfriend? I know why some girls are like that but why would a guy need a girlfriend?
Why do some guys always want a girlfriend
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