I put myself into Tapu's shoes and tried to see what it would b like to live her life. This is where it all started. Tapu as the only child used to all the love and attention in a very rich household. Suddenly she sees the girl she brought into the house getting the love too and her love is halved! Which child will like that? Its human psychology! And when Jogi realised it what did he do? Sent her to a boarding school to give her a punishment! Surely as a smart man he should have realised that this would only affirm her belief that her dad was sending her away because he loved Ichha more and was punishing her for trying to send away Ichha! Then it grew like this only. If I were in the place of Tapu I would have felt exactly the same way.