When Pooja spoke about her relationship with Yash she said she wanted Aditya to find the same love that she found with Yash.
Someone whose every little thing would affect him
Whose smile would make his day
Whose tears would make him do anything to keep her happy
She hoped that Aditya would get that bepannaah love
Zoya is definitely that for Aditya. Everything she does has an impact on him even at the very start he tried to stop Mahi from what she was doing to Zoya, and he wanted to make her normal again after her suicide attempt. When he sees her smiling it makes his day, when he sees her crying it breaks him because he doesn't want her to go through any pain he wants to give her all the happiness in the world. He would do anything to help her, he tried his hardest to stop the wedding for her and when he thought that he was wrong and she would be happier getting married than to be with him he didn't think about himself anymore but only for Zoya's happiness and took her to her wedding, he knew that he would have no reason to live without her but it was more important that she was happy rather than him. He will do anything to stop her crying like begging her father to not treat her the way he was, which is different to the way he was with Pooja.
Birthday v Wedding
During the flashback scene they showed how Aditya had had an argument with his dad and got angry and left the party. Pooja was visibly upset at his behaviour because she had put a lot of effort into organizing the party, she had asked him to stay back for her, but Aditya didn't pay attention to her he wasn't able to put the argument aside for the sake of Pooja, he prioritised his feelings over hers.
In comparison to this when Aditya saw Zoya crying and begging her dad to not throw her out of the house Aditya saw her pain he kneeled and begged Wasim to not treat her like this. He was pleading to the same man who had disrespected him, insulted him, made him put shoes on someone else's feet and never appreciated the number of times he had saved his daughters life. Aditya didn't think about all of this, he put all of that aside because he would do anything to stop Zoya crying and if this was the way he didn't care about what Wasim had done to him as Zoya's happiness and feelings are more important to him than his own.
It shows how Aditya has matured and his love for Zoya is not the same love he had for Pooja because for Zoya he would do anything to keep her happy and can't see her in any pain, something which he didn't really realise when it came to Pooja.
