But we have to all remember that Jai and his temper. He is very stuborn. If he has fallen for Bani and knows Bani also loves him. Then he is never letting go of her.
He might support her when she asks about Pia living in the walia house, but he is no way in hell giving up the woman her loves, again.
He had to leave Roshni because of Park road, and Pia left him at the altar. But now he has found his true love Bani.
Plus Massi is there so Pia will not be able to declare her intension in open because Bani and Jai both will stop her. And if she wants to stay in Walia house she has to keep Massi happy.
However, if Bani some how convices Jai that she does not love him and she was just drugged and wants a divorce. (She would only do this under a lot of emotional blackmailling by Pia). Then Jai might give her a divorce for her happiness but will never even look at Pia. And if divorces Bani then all 3 sisters will have to leave the house.
I think Pia is in the walia house because Sahil and Rano are supposed to run away. And she might encourage her, since Sahil is rich and pia values money.
Anyways, But really cannot see Jai every letting go of Bani knowing how Stubborn he is and his temper. And not to mention the Pandit.