For me it would be in this order:
1) The confession scene, that scene is a banger it gave me K3G feels
2) The scene just after he agreed to marry Sumo, that hand gesture "Mera dil toh", needless to say that my heart broke into tiny tiny pieces.
3)The scene where Shravan wakes up from uncousciousness and hugs him.
4) Now there is a tie: the first time he got drunk and the scene after the marriage in Ramnath's cabin "Jab dil hi nahi baccha to tutega kya".
5)Ramnath's confession
Tell me yours !