Why do some guys try to act tough in front of their girlfriends?

Bornnardmt
I'm probably gonna be called the bad guy for this. But my uncle passed away and I was in a very mood. I'm shy, but I won't take any mistreatment from any man or woman.

This athlete at my college who is known to be an ass started harrassing me with his girlfriend watching. She told him to leave me alone.

At first, I ignored him, but I noticed he was becoming very aggressive. He then crossed a line. He took my glasses off and threw them on the floor. I had enough, I punched him the face very hard. He was shocked.

Why do some guys with girlfriends act this way?
Why do some guys try to act tough in front of their girlfriends?
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