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Seth's best case scenario (and the most likely one) is that he gets away with it.
Bonbi seems unlikely to change her mind anytime soon and even if she does at some point in the future, the situation might be very different. She might have actually convinced herself that it's just a "normal relationship", and want it to end quietly, even if for no other reason than not to give us the satisfaction of being right all along.
I doubt that Bonbi would actually want to make a big scene out of it.