Ok let me put myself in Vansh's place first😆😆
Now in this case there r so many things to consider..first and foremost these two(Nani and Taps) r giving the impression to Vansh that it was a past affair and now Veer is happily married to Tappu which is lie of course😡..so in this case Vansh will hv to think whether its correct to leave Ichha unmarried for the second time in the mandap just because of her past
Secondly Nani is challenging Vansh's love here as per the promo by telling him that when Veer loved Ichha,he always trusted her but now if Vansh don't go to the mandap then this will mean Vansh is not trusting Ichha
Thirdly Vansh thinks that now Veer is already married to Tappu..he is not aware of their so called divorce and I don't think Tappu or Nani will tell about it either😆..so in this case Vansh just cannot go and ask Veer to get married to Ichha and make him his second wife as he himself promised to Ichha that she will not live on anyone's Uttaran from now on😉
Nani is blackmailing Vansh from all these above mentioned points..so if in this case I was in Vansh's place..mayb I would hv gone to the mandap and married Ichha..yes I could hv probably gone and ask Veer once about all this before getting married..but even then I don't think Veer will confess that he still loves Ichha..he too might lie and tell Vansh that it was his past but he is happy with his wife in the present/...so from all angles possbility of Vansh marrying Ichha becomes more becuase of the way Nani twisted her words😡