Mother finds out and forces him to marry her

So because Piyush ruined her reputation in Agra, the mother tells him that he should marry Dipika. The mother was suspecting Sushant and overheard conversation of Piyush to Sushant about the video being played at the cable tv of Dipika given to Piyush by Sushant and decides to report to police everything and takes Dipika and her family to the police station apologising to them.

Prediction it was.

I was thinking it would happen like that how the leads get to them marrying. Because right now its not looking like Piyush is going to let go of his Sarika obsession.

Yes, youre right. He seems head over heels for Sarika. And Piyush's family seems to think hes doing so much for Deepika, they may mistake it for feelings for her.