It means changing relationship. Your best friend may become your wife (girl) or brother in law.Your grandparents may become your friend. These are also example of changing relationship.It doesn't imply Extra-marital affair.The name of the show says everything. Badalta Rishta = Non-traditional Relation = Extramarital Affairs.
It's my view bro why are you getting so hyper?
And, it's an Indian TV serial here only craps things can happen but this is against our culture so it should be removed.