I don't think that's a term I've ever really used. While it sucks to get cheated on, I'm of the medieval-type opinion seen in Chaucer that it's an L to think too much about your partner's sexual propriety. So the real failure is in getting fixated on that kinda stuff. I get that it's a joke a lot of the time but, at risk of sounding kinda dorky, I prefer my insults to reflect something I actually believe.