Madhu's imaginations and her own way to convince RK with love letter was good but last part broke many hearts.. many of us are blaming RK and hating him but whatever he did it was a reason!
RK knows..Madhu is not completely well...she is weak but still she is not taking care of herself and cooking food for him...it hurts him. He wanted his BIWI to be fine and healthy. He wanted to give her protective shield. He wanted she to be happy. BUT he express his views in RK style.
Whatever he said to Madhu was perfect. I am sure Madhu will surely understand the hidden meaning in RK's anger and rude behavior.
Probably next week we will see RK missing (going to his Lonavala / Khandala Bunglow without informing anyone), Madhu and Ma gets worried. Bittuji will try and find his whereabouts and then Madhu go to scold RK...in course both confess their love.