'Uska dard mehsoos kar sakti hoon'...she didn't just say that for the sake of it, she really feels what he does. It disturbs her soul as if it's physically hurting her. What Saras silently suffers within closed doors, she was expressing vehemently in front of DukhBaa. She was asking her why isn't anyone helping Saras? He's in so much pain, why can't anyone do anything? That was her soul screeching for help because she can't handle it. While everyone looks on, Kumud is the one who is suffering alongside Saras. I think even DB was quite shocked to see Kumud so shaken up.
The way her tired eyes lit up when she saw Saras in the mandir. Man I have not seen her in so much love as I did today. She seemed hopelessly in love today and she felt the relief of seeing him ok. Even Saras knew she was outside the whole night, their eyes said it all. That protectiveness she has...phew! She didn't shy from telling Nandu off either. She didn't care that Saras rejected her, she understands him completely now.
SOULMATES <3 Thats the definition of their relationship.