Who is not selfish? Arpita is very honest and frank and is not able to twist her words and gives the impression of being selfish;look at Rooprekha- from day 1 ,she is claiming that she and Arijit are the most deserving in the group; she even had a confrontation with Gurpreet while rehearsing for 'dhola re' because she didn't consider her to be at par with herself.Then, when she had to pair up with Amit, she very shamelessly blamed her performance(or lack thereof) on Amit.
Now, look at Arpita. When she had to team up with Qazi(who was not such a good singer at that time , mind you) she never complained about their differences until Prashant Sir directly asked her.Also, despite her reservations about Qazi, when she was asked her feelings about being fame jodi with Qazi,she was very graceful about it.