Telling tales? They’re not nursery children. This is so damn dismissive of a woman’s agency. Yes, OP, keep quiet while this woman has her future, her home, her children’s family stability, her own sexual health, all put at risk without her consent or knowledge. We wouldn’t want to gossip, because that’s a thing ladies do, you know! They’re such gossipy things. Tinkly laugh.
I mean, I live by the idea of “treat others how you would wish to be treated,” and it pretty easily informs my choices on simple dilemmas like this. How would I want to be treated? I’d want to be told ASAP so that I could make decisions and stop being gaslit by a cheating bastard. If you treat people how you would want to be treated, you won’t always get it right (different people need different things), BUT in general, people will respect someone who treated another in the same manner they treat themselves, even if points of view differ.
“Telling tales” 🙄 It’s like people using the word “grass.” We’re neither nursery children nor are we drug kingpins. You can just use the proper words. If you mean to say, “Just stay out of it, you nosy bitch,” to OP, then do it; at least, don’t hide behind vocabulary.