I know right ! That's what I mentioned few days back somewhere that makers wants to show that he always knew.
Disappointing part is - as a person he should feel distant from his mother if he knew this, specially after he saw that even after the breakup, his mother who claims to be happy with his happiness, didn't come forward to end the game and continued to play without any remorse.
I am happy that Dev knew this all the while which pretty much explained why he never tried to score with his mother regarding Sona, but all his meaningless 'putting head on Ishwari's lap' etc etc seem SO krap now 😡 Could he not do all these and distant himself a bit from this woman 😳