Okay i think like the reviewer says..
Shahzaib is in guilt and knows he doesn't deserve her any more especially for putting such a big tohmat on her and not trusting her. He goes to meet her one last time. Not to beg or plead or anything. Just to tell her that he was wrong and she was right. He doesn't deserve her and that he is the root cause of all the problems in her life. Which is why he has decided to go away from her life. But before that he tells her that he loves her no matter what.
Isra listens heart broken. And her tragedy is that she loves him inspite of everything. She KNOWS very well that Shahzaib can never be alright now and that he cannot live without her as well. So if he says that woh bahut door chale jayega, she knows he is up to no good. And can sense something bad happening.
I feel Shahzaib does attempt to do something. Cuz come to think of it, he has left his house for ever and now he is going away from Isra for her good. So what is left for him? Shahzaib doesn't look like he would wanna start a new life so him moving away for ever doesn't go well with him. He has no reason to live. Isra se das bardari meri maut hai aur tab jab uske khud ki galti ki wajah se woh us se door ho gayi. I think some mar mitne wala pyaar karne wala shahzaib cant take it. Uske bas main hai hi nahi.
Now here, lets see what the writer plans to do. Will she make Isra reach on time and save Shahzaib and reconcile the two?
Or its gonna be an out and out tragedy.