I am wondering how it gets broken because in the latest pic from sets you see Neil still wearing the MS around his wrist and these scenes happen after Monday's episode. Plus Neil is in same clothes as the one shown when he breaks down, Avni same thing so maybe both truths come out at once?
If we go by what Payal says that means the Khannas learn everything which makes sense because they are going to want to know why Avni would still want to leave after there is no longer a threat to the lives of her and family so the timing is perfect for everything to come out.
Honestly when I first saw the video of Avni breaking down I thought okay it is because Neil finds out about Mowgli but it could very well be both truths coming out at once and Avni feeling everything is over. If you observe the one with Neil closely he was in pain, had it just been about Mowgli there would have been anger but there he was in tears it was as if he had known exactly why Avni did what she did.