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1 day agoThose two things are not the same. Quite the opposite in fact.
Others have already said that it’s a huge assumption to think of her as polyamorous without any proof, but I’ll add that if you think cheating and being polyamorous are the same thing you should read something about polyamory.
She can’t know if you don’t tell her. Sure, she can guess and make assumptions, but that’s not knowing.
That said, she’s in a relationship. That should be enough for you to back off and find someone who’s free and interested instead.