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will probably lose the girl, she clearly likes and is attracted to the guy so insulting him is like insulting her at too deep a level.
Well I agree that boyfriend destroyers are immoral and wrong, but I don't think you know what a boyfriend destroyer is. Boyfriend destroyers are not insults toward boyfriends, they are subtle re-framing techniques that show the weaknesses and neediness of the boyfriend in an amplified way, and thus makes him seem less attractive in the girlfriends eyes. Although I think this is very wrong to do and should never be done, I also know that it does work in the sense that it weakens attraction toward the boyfriend, but it doesn't build attraction toward you at all. If you couldn't win her over to begin with, destroying her attraction toward her boyfriend will be a moot point because you still need to attract her to you, and if you are going to spend that kind of energy on her you might as well just focus that energy toward a single woman.