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OP’s actions converted the closed marriage into an open marriage. There was no longer a monogamous marriage upon which to cheat.You cheated first, so I guess she figures she doesn't even have to play by your rules anymore.
EDIT: I suspect that she knew all along that you were secretly meeting with this flirtatious woman. She felt certain that you were having an affair with her. She had a revenge affair. She told you first to hurt you.