This is what I think they are thinking in their heads:
Raunak: "I know I gave Kasturi to Robbie last night, but I realized at the last minute that I am in love with her."
Robbie: "How could he do this to me? I never stopped loving Kasturi, lost her to him once and now I've lost again. What a bad friend."
Kasturi: "I wish they would stop fighting over me."