What if Arnav is too shattered to react ?? too angry that Khushi dared to leave him after the promise of never leaving..Too hurt and broken that Khushi too betrayed him by going away like his Mom ...who then will mend the bridge..
This is where separation comes
Kushi will think Arnav ditched her on the D day
May be shell know the truth of her parents death and all this will break her
Arnav will take time.. But before he reacts kushi would have left.. He
May think that kushi does not want to support him.. And will get supa pissed
Arnav may realise that there is no fault of kushi... After he cools down
It will be Arnav who'll build the bridge again I feel
287