If she was his imagination...
She would never force him to do the thing he dont want to...
Because when we imagine something...
Its actually what we want to happen and what is our desire...
But the scene clearly showed that Nupur was forcing him to go to the Excel and Mayu did not want to go there...
Like in Mohabbatein...
Whenever SRK used to see Aish...
It was always happy happy times or the times he wanteed her to be with him and she always supported him for the things he wanted to do not the things he denied to do....
Take Care
Zoya