In the past, RP used to acquiesce in any of CS plots, including agreeing to her forcing Kabir to marry her neice Ragini, her initially poisoning him, and later, being willing to attempt to kill Jyoti to placate her. On Jyoti's grihapravesh, seeing the welcome Jyoti was getting from Madam, she was willing to expose RP then and there, when he stopped her.
So here is the question - what do you think CS has on RP? Options above.
In yesterday's episode, when I saw RP talking to the pic of his late wife after Roshni called him dada-ji - a touching moment in & of itself - it seemed to eliminate for me the option that he killed his wife, or else, in private, he would have regretted it, not had such a conversation. But I'm leaving that option above, just in case anybody wants it.
So let's speculate this, until it comes out, assuming the CVs remember it.