Kavya looked hurt by seeing Adi and Anubha together and smiling. That must have made her realize how does it feel to Adi every time he has seen her with Shubh.
At least, she may have connected with his reaction after he saw her in the hospital twice recently.
Of course, Adi's reaction was completely unjustified. But, hopefully Kavya realizes what Adi must have gone through, especially after knowing Shubh and his intentions and most importantly for her hiding about Shubh from him repeatedly.
That will be a huge mistake by the makers/writers here, if there is no thinking/realization by Kavya here.