Durga or for that matter no goenka including sakshi and rajnath would have thought that just for his obsession of winning a bet, shaurya would go to the extend of killing his own brother.
After Durga will come to know of the truth behind this attack, he will blame herself too . But for shaurya's evil and pathetic deeds no one should be held responsible except he himself.
Shaurya while taking a selfie with dev's unconscious body said that dev is looking so peaceful as he is going to be with HIS nitya. Even shaurya knows that dev loves nitya, and so in turn he knows that his jealousy is baseless. so even if Durga tried creating this jealously and difference between them , it is only shaurya who is to be blamed here according to me.