The way he looks at her when she cries and says, "Galti se apni feelings boldi" in today's episode and "Ek ishara de dijiyega, mere liye utna hi kaafi hoga, poori umra bitaane ke liye". No words. One look is worth a thousand words. I can do without the monologues with such one glance - the glance of feeling her pain and admiring her at the same time. At the same time he feels her pain and he is in awe of her selfless love.
He can feel her pain because he cares for her. He can feel exactly what she is feeling. Also because it's what he has been going through for so long, the tussle between heart and mind, between what he feels and what's best for her. (Yesterday Vidhi was also contemplating the same, whether to listen to her heart and confess her feelings or to listen to her mind and ask him to marry someone who matches him in every way, whom his family likes as well)
At the same time, he is in awe of her selfless love for him and falls for her even more. He feels blessed to have been loved this way and it pains him a thousand times more that he has to let go of this love for her sake.