Atharva & Sampada's love story

No doubt these two are shameless people but still I want to know their back story. When did they fall in love with each other? Was it before Malhar - Sampada's marriage or after that? If they were in love before S-M marriage, why didn't they tell the family? If they can run away now, why not then? And if it happened after S-M wedding, it's even worse, I don't have any words.

I think they fell in love in college before s & m marriage but was 2 afraid to speak out or go against the family's decision

This family is pretty dictatorial. They especially follow whatever is the verdict of Aao Saheb. Atharva's sister begs Aao Saheb many times not to let Atharva and Kalyani married. But, they are helpless to do anything as Aao Saheb is firm on her decision. That too with the fact that Atharva is not even part of her family or part of that house. He was only in that house as a guest and still he is helpless, his elder sister is also helpless to do anything.