In today's episode when Prithvi comes to Sanju's room for giving her crossword book, he sees her crying. He is worried then, his feeling literally reflects on his face, he tries to talk about Sanju's present relationship with Ella, but at the same time he gets afraid, if Sanju also misunderstands him..
he tries to bring smile back on Sanju's face by giving her the good news that her "Certificate of Excellence" has been prepared, he also gives him chocolates - but ultimately these do not matter most for Sanju..
Prthvi is really worried about her, he can't do much - but he has tried a lot within his limit.