Why do some think they can get away with having an affair and their surrounding not getting it?

I have experienced married couples having affsirs, showing up pretending this game as if they are only friends. It is so obvious to everyone else. Disrespecting us as in them thinking they can fool us too. We're just for them to play with, they really think they're something smarter, superior themselves. Times when I refused to play along, just looked at one of them long enough in silence for thar one to get it. Another I was close to slapping across the face but held back. A third I gave my irony look to and said something. Then when their affair is finally out there, known to all, they act all ridiculous then too, How did they duscover it? We who were so discreet. Etc. Don't they get it is not only offensive to their partners but to everyone else they think they can fool too? We never asked to be around that and treated as idiots. No, thanks. Not gonna be some false witness to that.

Why do some think they can get away with having an affair and their surrounding not getting it?
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