At first, even before the serial started, the writers gave an impression to the viewers that KKB was based on Sense and Sensibility which the viewers gradually found to be utterly false. Then they gave an impression that the story is how kumkum and bhagya reigns supreme and most essential for a married life and that too the viewers found to be utterly false as the story started slowly revolving only and only around the third wheel.
So, since now the story seems to be revolved around only one character, Tanu, and nothing else, no story, no logic, sequence, everything going around on only one theme, how Tanu can be dressed up beautifully in each episode, how she can dominate in a household which is her friends and by forced relationship, her fiance's, live there completely from engagement and even dominating Dadi who was shown to be the main person of concern for Abhi, how she can plot and plot and plot, stoop low and low and low and commit number of crimes which need to be penalized and given life imprisonment, but still she is now the only dominating lead of KKB replacing the main leads to such an extent that we have to search for them out of KKB, she alone is enough to carry the story forward, the writers are so mesmerized with her that they are creating blunders in their story line, putting down almost all the characters and giving a story not fit for family viewership.
So, as per writers opinion, being bad and cruel is good, the person who does that is equal to a strong influential personality who needs to be highlighted always. So, in that case, think Purab in order to be good is turning bad now and Pragya has lost sense and essence and character. I just feel like thinking is Abhi worth all this now?
Why not Pragya go and search for lost Bulbul, find out where Purvi is, bring them back to Arora house and start their life fresh there. And Purab can be saved from becoming more bad.