Zoya is not making a mistake. She is protecting herself, it is called self preservation. She already accept that Aditya is leaving for France after the party. Subconsciously, she is giving Arshad a chance since Adi is leaving her for however long. Zoya doesn't recall the convo during her drunken stupor so she doesn't know plans changed. Think logical, it's already difficult to let someone go away and she recognises Adi has his life so does she. Zoya needs to realise her feelings. I think Adi needs to be mature and macho. I want him to tell her and I want her to reject him. Then to realise she does indeed love him.Makes it bittersweet!