Rohan may not accept this proposal one possibility
Another possibility he may accept this as he doesn't have any clue that he would have got married, coz he never met Radhika in her childhood.
Then Staying in the house Radhika may get to know that she knows Dev well
It could on on the lines of Mujsay doosti karogey or like Hum Dil De chukey Sanam or the movie Saajan
Its a mix of many ideas blended together
I think after 10 episodes when the leap happens we will know better.