This is not a spoiler - just a thought...
Dadi will not tell Arnav the truth before the wedding - she will reveal it either on the day, just after or a bit later - and she will demand that Arnav punish Khushi just like their family was punished and suffered because of Garima???
Dadi said to Garima , ' I will destroy both your daughters and ruin their lives' - she cannot make that happen if she let's Khushi go free and not married to Arnav. Not sure though, as if she cares for Arnav she will rather that he not marry Khushi than make them suffer after marriage.😕
She knows the truth will make life hell for ARNAV and Khushi anyways and that their marital relationship will be affected negatively...
And again, Shyam wants Khushi close to him and wants to break/destroy Arnav - so he will come up with this plan to reveal the truth after the marriage?...😡😡😡
So scared of how ARNAV will react - he loved his mother too much to let it go ðŸ˜ðŸ˜ðŸ˜ðŸ˜ðŸ˜ðŸ˜ðŸ˜