When Zoya went to Aditya's house and talked to him about booking the venues and caterers Aditya said to her that you've already been through heartbreak before and if it happens again I'm worried that there will be no pieces left this time. He was with her during that time the denial of what Yash had done, her suicide and the beginning of her moving on. He knows it was so difficult for her accept what happened and move on that if it happens again there would be no way back.
I feel like those words are also true for Aditya he's also had his heartbroken, Zoya is his chance to mend his heart together again, he's put all his efforts and confidence in this love, he doesn't care about anything else and if he loses this chance he will be shattered again and this time there would no way back for him either. This time he will be losing not just his friend but also his love.
The precap shows how he's on the verge of breaking, he is helpless, they are both in pain and now he had no choice but to try and get Zoya to understand because he doesn't want to experience that heartbreak again but more than that can't let Zoya go through everything again, when can try to stop her.
The acting from Harshad Chopda and Jennifer Winget is amazing, they portray every emotion of the characters to the audience so well that words are not even required.
