Guys, impossible to be with one girl?

In no way shape or form am I being sexist and rude towards males I'm just wondering why some of you find it so difficult to only be with one or if you guys are speaking seriously why can't it just be her? After personal experience I never understood why and always thought it was me, that I wasn't good enough but after speaking to others I've found out a lot of guys find it hard to only talk to one girl without having side girls I'd just like someone to explain their opinion on why they think some boys are like this?
Guys, impossible to be with one girl?
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