I was mulling over the mirror scene😃!
Kunal sees the mirror and hesitates to look into it , he is scared to see the person he has become , he says he has lost everything in life name, fame and above all Siddhi.Here it's made evident that he attributes his being to her.And then he musters up the courage to look into the mirror and lo! what does he see - Siddhi!👏
In his head his name , fame, desires have all manifested themselves as Siddhi , so when he saw Siddhi's relection in the mirror,I would rather say the mirror passed him a message.Muster your courage, conquer your fears and face life and you will be the man you dreamt of being.What makes and breaks a man is him alone , others are a medium.