Today when Sandy planted the bomb and was boasting how both Jai and Bani are going to die Roshni seemed happy to hear this news over the phone. She didn't protest tat she only wanted to kill Bani or anything. So does that mean she was ok wid the fact tat she was killing Jai. As far as I know Roshni loved Jai so how can she Kill him? I mean this is totally unjustified. It is true that her advances were rejected by Jai but that isnt a valid reason to kill someone. I remember Roshini was just planning to reveal the park road plot in front of Bani and nothing else but where did this mess come from. Only an insane woman would decide to kill a man who refuses to her advances and as far as I noticed Roshni is not insane. And today's episode also suggested that Roshini was the one who wrote a threatening letter to Jai and the one tried to kill Bani earlier in fire or it could be Sandy. But somehow this does not make enough sense. Roshni really had no strong reason to kill either Jai and Bani as she could have easily separated them with the park road secret. What seems to me is either writers could not think of any other villain and just opted for the easier option Roshni or there is more to the story than we know!