Diction? She just says Haan right? I mean Rads, when he asks her whether she loves him, she replies yes........Initially after the wedding when they play find the ring game, just by touch and behavior he realizes that the behavior is unlike Rads......Rads is shy and introvert, while Vish is bold...and tries to find the ring to win the game at any cost....Her mere touch makes Dev realize that something is different........
On the other hand, he does Rajpurhoit parivaar, he does all the rituals all over again, still cant feel her sparsh........