Because... don't you see it.
1) I don't believe they ever broke up and them being in the same hotel was planned... you really think these these details wouldn't be ironed out first?
2) Even if they did break up... Let's imagine the scenario.
Two sad lovebirds who just broke up are living in the same hotel... they are bound to run into each other. And of course, Priyanka at one point or another is going spot Shahid and Anushka together and get mad and furious... She will, in the middle of the night, start slamming on Shahid's door and demand an explanation as to why he had to stay in the same place as her and then on top of that go around with Anushka. Jealousy will then lead to a fight and then make up 😳 Since they broke up recently, the feelings are all still intact, they just need a push and this gave it to them. 😳
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