In Varsha's case I will blame Varsha more than anyone. Already she was getting married to Satish against her wish. She agreed becoz of the family. So it was her responsibility to come clear with Satish about her past. Whether he wanted to hear or not. She should have forced him to listen to her.
Any relationship is based on trust,honesty and understanding. Specially in a marriage these 3 are very important.. So all blame lies with Varsha.Ppl like Rasika are all over and they use these situations to their advantage. Gossip is popular worldwide for a reason.