Meri Adhoori Mohabbat

I read somewhere that Nirmalta and Siffat get married, and Siffat moves back into his house with Nirmalta..and thats when the "Climax" starts when rehan and nirmalta live under one roof with different spouses...

Lekin this doesnt make any sense to me...Because does Siffat marry Nirmalta despite the fact that she is a hindu?

And what about nirmalta...Marrying siffat is equivalent to marrying gautum...she doesnt love either of them....so if she does marry siffat, that doesnt make sense....kyun ki agar usko rehan nahi milna tha she should have stayed with gautum...

And that last case i can think of is maybe nirmalta converts to Islam but than wouldnt she go out looking for rehan..find out him and siffat are brothers and NOT marry sifaat?

It doesnt make sense to me how sifaat and nirmalta can get married for many reasons...!!