In Shimla Maan had fought with local Politician's son , That person was behind Dev first & He forced Dev to leave Shimla & know he is poisoning Maan's Brian . This is the test of Maan's belief on Geet . We have to see that can an outsider use Geet & Dev's past to poison Maan .
I think this situation was very necessary for the future of Maaneet's relation . As this can happen anytime . Here Geet wont be able to hide about the turth from Maan for much time . She will definitely tell Maan soon . But till then Maan will not speak with Geet even after staying in one room . He will not behave properly with Geet .
But when he will know the truth Geet might be totally stressed out & might be admitted in Hospital . Then Maan might feel that he was acting like a total jerk . He even might blame himself for Geet's condition . Then even Dadima will feel bad for mentally stressing out Geet so much , even she might feel guilty of her behavior towards Geet .
They all will feel that Geet was being asked to do things without understanding her mental state . She did everything just for Maan & Dadima & They did not think about her for a second .