Math's teacher will come to teach her brother who will be as an Ideal SIL and will take care of her so well that her family will want her to get married to him.
Raghu will see him taking care of Antara and will get jealous. Meanwhile even Daya Mai will come and will not like Antara as she does not know the past but will see Antara hurting Raghu (emotionally and mentally) and will get the new female to be Ragu's wife.
Antara will not be able to bear this and will go to Kashmir and after she leaves Raghu will not be able to stay in peace and Aaji will send him to get her back...
Just a guess...