I get that they want him to see her signature, feel bad about it... but in the end they made him, as @Nilmi mentioned above 'leave like a loser'. He had a whole day where he could talk to her... but didn't. He came in the room in the night peeking to check if she is asleep.. entered relieved that she is.
There were things he felt that made him give her the papers, that made him look for her, hug her... but then... she isn't a 'I have no emotion/feeling in me zombie'. Why avoid talking? Can he care about what she may want to say? Yeah... she hugged me back. Job done... I've to leave? Just because the writers' intended plot could play out? Blame it all on Virat's 'unpredictability' if it doesnt go well?
Also read a view that he doesn't know what love is cause what he felt for ex wasn't love. Yeah... sour grapes perhaps. In that case, what Ammu feels for Virat is 'brain-freeze' not love either ... which is what I see her feeling in most of these chem scenes.
PS: Think that they visualised him leaving the way he did and liked the idea and had scenes leading to that scene. They did give quite some footage to the scene - 3 1/2 mins. [And it was a good scene in isolation / by itself.]
.... Caterers bhi bulaya hai kya? She does call him up and in the end learns she has signed the paper.
Fake wedding mein toh bahut tayari thi
2 min of silence after watching update.Not for them but i don't have words
Vrat 
turu lub



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