In episode in which Neeti realises truth, in her dream sequence, she explains to Pari that she would have given up Sanju if she were honest. Therefore, she only wants Sanju in order to spite Pari and have her revenge. Sanju is just a means to an end. She likes him but her hatred for Pari is her junoon. Same is with Pari/Parvati. Instead of focussing on everyone, her prime focus for revenge is Neeti. She is in same situation Neeti was in and their action is same: hurt each other and use Raju as a means to hurt the other and also don't hold others and especially Raju accountable.
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