who is the dumbest ?

Ravish or Vividha ?

Ravish's ignorance and foolishness has cost both kalindi and vipul their lives. And about first love being the real one, both Vividha and Atharva has proved it. Ravish was always about big talks and no actions, he used to lecture how he considers Atharva as his brother but he didn't think once before marrying pregnant Vividha, he used to give lectures on how he's born to only give and lose, but he fails to see how because of his self righteous attitude others lose previous things from their lives. Now his non existent love for Vividha was just for the sake of it, his love wasn't something epic or unrequited otherwise he wouldn't fall or allow kangna so easily in his life. We have seen how Vividha could never allow anybody take Atharva's place in her life because that's how helpless and devoted first love actually is, whereas Ravish's character has more or less become a joke, repeated mistake but no realization.

Coming back to Vividha being dumb here, well she's gullible and writers have always taken her character for granted. To accommodate kangna and Ravish's nonsense romance, they've made Vividha a scape goat. But good thing is that she's nowhere provoking Ravish to do the nonsense he's doing by being with kangna. She should and will trust Atharva sooner or later but I can't say the same for Ravish here.

Atharva , well he was always a calculative and no nonsense man. He still is irrespective of how the cvs have ignored his recovery phase. I am glad he still believes that kangna is weird and shouldn't be blindly trusted. Also now he has started doubting the reality of madhav's birth, he probably will try to deny it initially as they all love Madhav a lot but truth is bitter and has to be accepted that Vividha and Atharva most probably has a daughter.