Why are there SO MANY men not keeping their eyes only on their woman?

What is the point of being in a relationship with a woman if you (men) check other females out, flirt and things that your not supposed to do when you say you love your woman and stay with her?
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You will not see real things within 3 months, you see more things in long term relationships, so yeah it’s men whose I dated over a year.
Why are there SO MANY men not keeping their eyes only on their woman?
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