My Opinion -
Manik was in a relationship with Alya for 7 years but still he had never felt the kind of emotions he felt with Nandini. This makes one wonder whatever kind of relation he had with Alya - friendship / attraction / infatuation / peer pressure / being habituated - it was NOT LOVE.
So Manik is experiencing love for the first time - it started with curiosity about the girl who had the guts to punch him, wanting to know her and be with her by making her his spot and then obsessing about her even after he freed her. Later having admiration for her simplicity, innocence and strength of character with which she tackled all odds. Finally without his knowledge all these emotions turned into a strong attraction and slowly Love.
But for the sake of friendship and fear that Dhruv does not get attacks due to rejection, he tries to sacrifice his love without realising how painful it is going to be. And now he is at his wits end because he regrets his decision but at the same time cannot do anything about it as what's done is done. All the emotions confusion, depression, hurt, jealousy, yearning is playing havoc and it is now to see how much time is he able to endure it. And it's just been 24 hours for him...
For Nandini too it is first love and her relation too started with curiosity about FAB 5, that later turned to fear, disgust and hatred for them especially Manik. The disgust and hatred turned to again curiosity and admiration for Manik who had immense love for his friends, who could go to any extent to protect them. Slowly she started being sympathetic towards him and then it turned to liking, when she realised he was attracted to her. The liking slowly turned to love when he confessed his feelings for her.
But by the time she could grasp all the emotions he broke-up with her. She still loves him, yearns for him but is hurt at how he played with her emotions, how he broke her TRUST. What is confusing to her more is the way Manik still listens to her, seeks her out and yearns for her. The night is still not over and so many things have happened that she had no time to process the break-up...
Hope the night that tore them apart is also the night that brings them together. With dawn let there be a realisation that they are meant to be together and not apart.