how did the narrator realised that ranga had fallen in love with ratna

The narrator saw that Ranga's face was shrivelled when he learnt that Ratna may have been married a year ago upon enquiring about her marital status. His face was shrivelled like a roasted brinjal because he had taken a fancy to the girl and now his hopes seemed to have been dashed. This is what made the narrator realize that the boy had fallen in love with the girl.