I have a feeling Gauri and shashank will not marry as gauri herself saw shashank rejecting her when she asked for his help. If he didnt believe she was innocent then why would she now marry him. I think gauri and Shiv might marry as mahen kapoor will think tht shiv was behind the raming of gauri.
I think Shiv will marry her as he feels guilty for his friend and also palak (it was listening to her conversation tht gauri went to the room otherwise how would shiv's friend know she will be there unless they planned it together) making gauri seem like a prostitute.