There was an old regional movie I watched. Hero was supposed to marry a girl. But she was already in love with someone and pregnant too. In the movie, the girl commits suicide because her lover ditched her and the hero gets blamed for her death. Here, may be Gauri delivered her child and then died. And Shiv got blamed because of Mandira's plan. There the hero was so affected, he was going to commit suicide and was saved by heroine's father. Here Shiv lost his mental balance in guilt.
Shiv Shakti.. they look perfect together.
And their vachans are so deep and meaningful.
Doctor saab is such an earsore for calling your husband 

I just loved the detailing of Shiv Shakti ke piche Shiv Shakti
Otherwise they have so many loopholes in the narrative

But i still feel this will not go completely according to the promo.. Shakti will learn Shiv's truth before the wedding 