why is kumud so upset

What did she do someone explain in detail please so confused

She is disappointed with herself for crossing that line in their relationship!! I think she feels she let herself and her parents down by having premarital sex!

It is her point of view, being a traditional girl I guess it is to be expected! But of course Saras does not see it that way! He thinks that what happened between them was normal! And it IS! But Kumud is feeing guilty about it, coz she knows her family trust her a lot and would not expect this of her!!