thank u soo much nlee but there is some mistakes from my summary here are the correct points plzzz do forgive me for my mistakes
As days went by, Mataji started to like Roli for his grandson Siddhant. She talks with them, and both of them agrees to marry. Siddhant said yes, because he could not say "no" to his family anymore as he has already given them much pain. Roli agreed to marry because marrying was the only way to get out of Prem-Simar life.
However, when Mataji announced Roli-Sid's engagement, Prem-Simar had to reveal that Roli can't marry Siddhant because she is already married to Prem. Everybody gets upset and decide Roli-Prem marriage will happen again in front of everybody. Mataji said divorce is not a choice since marriage bond is true for seven reincarnations/lives.
Roli-Prem get divorce secretly with the help of Siddhant. Then, Simar-Prem get married without the knowledge and consent of the family. When Mataji heard about Prem-Simar marriage, she congratulated Simar for her selfish act and taunt her saying that "you again ruined you sister's life. Now, by marrying her husband and making her a divorcee. She is only 18, and no man from a respected family would ever marry her again." Then, Siddhant decides to take a step to save the innocent girl Roli, from the evil eye of society. he takes roli by her hand and puts vermilion on………(everything else is fine)