Personally I think there needs to be a scene where shivam apologizes to nimmi. What he did today was not okay at all, how dare he slap his own sister! No matter how angry or how wrong the other person is, slapping a girl especially your younger sister is never okay.
Seriously, for the first time I actually liked dadi when she was hitting shivam for hitting Nimmi. He actually deserved it this time.
I hope they show a scene where shivam apologizes, and I also hope Nimmi doesn't forgive him just yet. Or even if she forgives him, I hope they show a strain in their relationship that they work out because shivam didn't just hit her, her broke her trust by believing that she would do something like that.