Remember their first Meeting... RK was introducing the Studio to press and then she came... and this was his reaction...
He felt her as a dream.. thats why he was shown looking at her still playing the piano... He was lost in her eyes.. and when she said her name as MAdhubala.. then he realised... He just fallen for this girl who dared to file a case against him... and it shaken his EGO.. then its history for us...
Again He got lost on Madhu when he saw her at the Party night... Thats why his expression changed from irritation to mesmerized... and he himself gave his hand to her unknowingly...
And one day RK himself asked Madhu what was her feeling when she saw him for the first time and her reply was.. "Attitude... Gamandi.. Dramebaaz..." and this is what he said about his feeling when he saw her for the first time... "Biwi feeling aane keliye kuch sochna padtha hey.. Us waqt sochne keliye mera Dimaag nahi chal raha tha.. mein tho Brain Dead tha... kyu ki Dil Super Active tha... In Ankhome khoya huwa tha..." So He couldn't think anything else when he saw her...
(English translation: Biwi to have feeling we need to think something.. that time my brain was not working to think... I was Brain dead... Bcos Heart was super active... Lost in this eyes...)
And in last epi when Press asked him.. When did actually the Love started... he kind of confirmed it with his reply that... he fell in love with her thevery first time he saw her eyes...
"Bas yeh samachiye.. Pahali baar jab mei ne Madhu ki nazrome dekha.. Bas usi pal pyaar hogaya..."
(English translation: Just believe.. When i saw Madhu's eyes for the first time.. that time itself Love started..)
Edied to add the English translation...