1) You had to snatch the man of your life and so you had to crush the competition
2) Because you were in a relationship with a guy and some other gay was circling around...
3) some dude was testing yo man and you had to smack that B down
I live by this quote: "If you hesitate between me and another person, don't choose me."
But with regard to scenario #2, I never have (because I've never had a boyfriend, lol!). I am not a violent person, so, I would pray that I would just verbally dismiss the person as classily as possible without having to physically attack them or attack their character.