I think now Riddhima will misunderstand Vansh.
If she sees Vansh marrying Ahana, she might feel that he did everything on purpose...the whole jail thing...only to push her out of the way, and marry Ahana.
Dadi wouldnt have allowed him to divorce his wife just for the sake of a gf...so he made all this plan.
Riddhima might think this way. I would have, if I had been in her place.