Why do taken men flirt with other girls?

LaFemmeFatale
It often happens to me, some handsome guy flirts with me and I don't even doubt he's single cause he chases me all day and then I find out he's taken.
Today I met that guy, we flirted a lot and even hugged me and he said he had never felt so strong connection at first sight and etc etc... My girl friend was near us and she said he definitely tried to impress me and obviously liked me but then another friend told me that he has a girlfriend.

I don't want to have a boyfriend if that's how all guys are. I imagine myself in the shoes of his girlfriend and I would not like if my boyfriend flirted with another girl like that.
Why do taken men flirt with other girls?
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