yes hina,it was main concept of the drama,but sad part is they build up Armaan's character with some light and showed us some of his kindness and capability to feel compassion.So this turn is very devastating to people who did not expect him to be all dark.He still loves sobia and is jealous of Hamza.
He is shamefully using ujaala so he can have happiness with sobia with baby.He is failing to see her capabilities,this is not a woman who can accept or compromise.
He is in for major shock, what I am not liking about Ujaala is taht 2 days ago she begged Armaan to take her with him by hook and crook now she was crying on her way back to her in laws because she cant bear the thought of heartbreak for Hamza. To me this turn in her heart,be it compassion or love is real downfall for her character....it does not go well with her character.
I also think that his mother's smooth as snake oil plan will be thrown into major chaos by two people ---sobia with her taunts and Armaan with his insecurity and jealousy for her relationship with Hamza which has taken this very angelic turn to a platonic friendship from her side and a very deep love for him.