A chance meeting between Ayan (Ranbir Kapoor) and Alizeh (Anushka Sharma) ends up with both kissing instinctively. Later, when both break up with their respective lovers, Lisa D’Souza (Lisa Haydon) and Dr. Faisal Khan (Imran Abbas), the two begin to spend time together at discos, restaurants and tourist places. While Ayan falls in love with Alizeh, she considers him to be a friend. One day, Alizeh stumbles upon Ali (Fawad Khan), her ex-boyfriend, who wants to reconcile with her. Confused, Alizeh stops hanging out with Ayan and the two cease communication. A few days later, Alizeh calls and invites Ayan to her wedding with Ali in Lucknow. Ayan is petrified on hearing this but agrees to the invitation. At the wedding, he tells Alizeh he loves her but she rejects his feelings causing Ayan to leave the ceremony heartbroken.