Here's a common situation I'm talking about, I'll just make an example for clarity: Johnny is married or in a relationship with Bonny. Bonny leaves Johnny for Bobby. Now, if you were Bobby, wouldn't this bother you? What's to say that Bonny isn't going to do the same thing with you? I never understood how people were willing to sort of "steal" mates from other people, and how they don't think that they might do the exact same thing to you. or another single people that have affairs with married people, and even worse, married with kids.