Neil isn't involved

That's why avni says"is dhoke ke liye mujhe maaf kardo" in the background.

I think Neil still wants to marry riya even after knowing she ran away so that he can spy daya and to know the real face of her.

When it comes to Avni he dont think about himself 😛😛

But that wouldn't matter as he still heard everything daya had said about riya running away, forcing riya to marry neil so that she can get money from prakash to save her house and business. He heard how daya said to bring back riya by hook or by crook and that force her to marry neil. He would believe that she has been forced to. I don't think he got the chance to talk to her before the marriage.