Ishita's parents decided to get her married to their family friend's son, Subbu, who is a close friend of Raman.
Raman hates middle class girls who marry an upper class boy because he thinks that they do these on purpose of money not out of love.
IshBu engagement happens. Subbu feels that Ishu is not happy with the marriage. He confronts her and she tells about her first love with whom she never had an opportunity to share what she feels and thinks that she is not a person whom someone craves for. She has an inferiority complex and says that she will need time to accept this relation and a space to believe that Subbu loves her wholeheartedly with all her shortcomings.
Once when Subbu Raman and their gang were having a chat, they asked him about Ishita. Since she belonged to a richer family, he feels embarassed in acknowledging that in public because he feels that others may think ill about him or being a money digger. He lies that she belonged to lower middle class. (Subbu himself was one anongst the most hi-fi students of the college)
That one comment had badly ruined Ishita's image in Raman's eyes
Later Subbu told Raman about Ishita and her feelings thinking he would help.
Raman started thinking ill about Ishita and her family and that proved to be a proof for his so called theory of middle class people