Well think about it this way. Saahir also has been through betrayal. It's been seven years. Zeenat has probably suffered the worst fate of outcomes. She ended up in a state she is neither dead nor alive. This too when she was very young. Most people would rather prefer death as you do not have to live through the misery of being a useless being every single day. Did Saahir ever put his pain aside once to think through what Zeenat might be going through? Nope in fact even after 7 years of her suffering through the fate he still comes to the room only to have hate talks with her. He still has not put his begrudging and ego aside even seeing her in the worst possible condition. Its might be understandable since she scarred him when he was very young and naive.
Saahir also done the same exact thing to Arzoo that Zeenat once done to him. If Zeenat's condition does not matter to Saahir and doesn't not help him put his grudge aside. Than why should Arzoo put her grudge aside to help Saahir in a matter of days? It took Saahir 7 years and he still holds on to the grudge as tight as ever. Why are their special rules for Saahir that his attempt to play with someone's emotions should be excused and not Zeenat's? That he is worthy of forgiveness right away and Zeenat not even after 7 years of being in a coma? That he is allowed to hold on to grudges forever and other characters are not allowed to hold a grudge against him? That his pain is considered awful? But the coma Zeenat has been in for 7 years must have been easy for her?
Just the mere fact that this is meant to be a love story should not give him all these special exemptions. If he is allowed to begrudge someone for a similar deed for more than 7 years than Arzoo should be allowed to begrudge for some time as well. She is also human she has the same type of emotions inside her as Saahir. They can't be battled overnight! Furthermore Saahir needs to take more steps in making her trust him again other than feeling possessive, making puppy doll faces, and emotionally blackmailing her. She trusted a man in her life for the first time and he badly broke it. Saving her from goons is not enough to rebuild it. She might have called him in a state of emergency but she prob was not completely thinking things true. She dialed his number in panic. It might sure that deep down she probs wants to trust him again but pain of the heart break is too severe.
P.S. This is not about any other character and how they are interacting. This is purely my take about Saaz. It needs time to come to any type of normal equation again.