these are all jus the twists of the show
AR shud still be together, cuz all u have sed above are tests for AR love and whether their love is true or not, which it is
Their love isn't true anymore, because Riddhima loves Sid now, she's MARRIED to him. It's a successful marriage, and Riddhima, as a good wife but also because she is in love with Sid, cannot go back to Armaan. It's like that, changes happen in life and she accepted it. I am trying to be objective, and from an objective point of view I still think it's unfair to put AR back.