High On Kadhal - Season 1 Episode 3 Fever and the Party

Vijay goes to meet a girl named Radhika, whereas Nakshatra coincidently meets his classmate Rahul in the gym. Where Vijay gets possessive with her. Where they both have a little break from each other themselves, Vijay tries to convince her, but she doesn't give a proper response to stay together again. What happened after that, and how did they come to understand each other?