Mac mentality
When you only go after a girl who is already taken because you think you're the best and no one else is worth your time.
I saw her with her boyfriend and still went after her. I thought I was the best and he was just a background character.
He asked her out even though she was with someone else. He said I was the best and the other guy was just a sideshow.
She was with someone else but I still tried to get her. I said I was the best and the other guy was just a placeholder.