Why is cheating and flirting with others being normalized so much?

Seen that a lot, people in relationships flirting with other people. i have had girls I’m not even friends with touch me in intimate places. I back off and they put their hand back even then. Those same girls have/had boyfriends.

i have also heard people say “im just having fun” when they are told they are not being loyal to their partner.

before you say “flirting isn't cheating”, look up the definition for flirting. It literally means showing sexual/romantic interest in someone. How is that not cheating?

Why is cheating and flirting with others being normalized so much?
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