Abhinav overheard a convo between Rakhi and Demo
He thought it meant Debo was planning to do something that'll make Bigg Boss kick her out
Then the drama started
Rubi thought Debo was doing it intentionally so that it escalates to a point where they get physical... she even told Arshi to listen as she knows things.
So basically, Rubi didn't even think Debo was really hurt because she thought it was preplanned, which is why she was upset... because THE CONVO ABHINAV overheard and mistook it.
WOW!
Look how complicated life can be.