It is quite obvious that some footage is not being shown regarding whatever between Mandana and Rishabh...and so I feel it is unfair to put the full blame on Rishabh since the audience doesnt really know what actually went wrong between them.
Although Rochelle seems to be very satisfied with this rift between RIshabh and Mandana.
That's exactly what I was thinking.
We don't know what lead to this Cold War.
The only bit of information we have so far is , mandana does not consider rishab his friend, like he said to Rochelle that he will continue to b her friend.
We haven't been shown the entire story.
Blaming rishabh for the rift is unfair!
Mandana is known for using her friend as per convenience.