Why do people flirt while in committed relationships?

PhotoChick87
Okay gag. When someone is in a serious relationship whether their married or not, why do they feel the need to flirt. I know both men and women do it. But I have came across married men who flirts with me. I always feel like flirting with someone other than your mate is consider cheating. This is something I wonder for a while. Recently a married guy flirted with me and I just find out he was married. So gag why do people flirt while in a committed relationship? And do you consider it cheating? Cuz I sure do.
Updates
+1 y
The person that inspired this question. Was a guy who work on a money truck. He use to constantly flirt with me. When I left the job he ask my friend about me. So I gave her my number to give to him. She said to me that he said y'all going to get me in trouble. And she ask was he married and he said yea. She said she took my number back.
Why do people flirt while in committed relationships?
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