From Ragini-Ranvir's first meeting, i still am certain that he is interested in Sadhna and all he feels for Ragini is friendship. And when some guys called Ragini amavas ke raat, he just felt bad for her and was being nice to her just to cheer her up. And all this was being misconstrued by Sadhna who maybe now thinks that Ranvir is interested in Ragini.
I don't think Ragini and Ranvir make a cute couple, like Sadh and Ranvir would. She looks too mature for him, and he looks too young. But i think maybe Sadhna may suggest to Vasu to get Ranvir married off to Ragini. I so hope Sadh and Rnvir end up together finally. Alekh looks more mature, so he would suit Ragini more.