Why Is Siddharth Upset With Sanju?

In this episode of Ziddi Dil Maane Na, Sanjana makes everyone practice in the academy, she saw Siddharth continuously doing push-ups. She asked the reason behind his lostness. Also, she tells him that she is just a trainer for him. Listening to her Siddharth gets upset and sad. Besides, Karan thinks about Param's fake identity.