Why do some men cheat on beautiful women?

I’ve seen this all the time. Including my ex. He has a perfect girlfriend, really pretty makes straight A’s has a career and good head on her shoulders. She met his family and friends in a heartbeat assuming he was really in love. She even posts what great of a guy he is and how happy they are together. In my ex eyes I’m probably beneath her. He’s constantly cheating on her and attempting to get me in on the cheating too.

Why do some men cheat on beautiful women?
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