So I am watching the episode now and Vansh is being really helpful and cute for his wifey today! He brought sargi for her, tried to sneak in a few pieces of almonds and also read the KC vrat katha when Riddhima couldn't speak because of the smoke.
And Dadi said that no matter what struggles fate has in store for RiAnsh, there love will always overcome them. She mentioned this KC night specifically as she said that after tonight, RiAnsh's love and bond will grown stronger.
Also, I would like to mention the "kaala saaya" aka the person under the black blanket. He/She is the one who did something to the lamp that Riddhima was going to light up, which further lead to her not being able to speak.
When this happened, Vansh was talking to Riddhima trying to make her eat the almonds. I don't want to think like that but could it be that Vansh was trying to distract her? And maybe that "kaala saaya" is Aangre who is following his boss's orders?