They are kicking off the process of finalizing the ship. If Admat (which I think is the ship), then Nehmat needed this clean slate and emotional freedom to move on from Ekam, She couldn't have done it as long as she was being 'blamed' for destroying lives. Advait needs something that tells him that she is not all talk about trying to marriage work. He needs to see commitment.
If Nekham - this mu had to be cleared before they can find a way back to each. Makers can stretch it as much as they want - but is really a very short way back. Advait wants her to go, Shamsher will not object. Ekam has made it clear he wants her back. Rupi will do what she asks. She needs to make up her mind. How hard is that?
I don't think Nehkam reunion is going to be that easy.
* Ekam wants Nehmat back, but his family is not going to agree with his decision.
* Shamsher will never allow Nehvait marriage to break.
* Sooner or later, Advait- Harleen marriage truth will come out. Then Advait will have to have Nehmat by his side. Because if Nehmat doesn't support Advait, his political career will end.
* Lastly the perception of the society. Nehmat has lived as Advait's wife. So it is not going to be easy for her to leave that image.