Is this still counted as cheating

Me and my hubby have just recently became Polly and before we even talked about it being okay for my husband and our new partner to have sex without me being there they disided to do it anyway and both lied to me about it until I found proof of it in his phone and he says cause we are Polly its not cheating but I feel like he did cheat cause he chose to lie and try and hide it from me

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