Their first dance was a trance magical moment for both of them. They both were equally engrossed. They always did have a spark and that dance was their moment.
The song chosen was absolutely stunning and did summarise their equation that was going to be in future.
mere Naam tu'
She had been spoken for, not committed but still he did see her as HIS'. Because the song does culminates with the lyrics
Payegi Na khud ko tu Mujhse Juda...
Tu hai Mera Adha sa Hissa Sada'
There is no name to their relationship but she will always be his better half. The better half that made him meet his better half soul. Rocky never knew that he was capable of earning respect before that. She taught him to gain control of his life.
She always made him a better person after Chintu's death.
I might say RV is her friend because she did share with him much more time than what she shared with Rocky. Having said that, the time really doesn't matter or does it?
That takes me back to the train scene where Rocky chides her that 24 hours marriage doesn't mean anything. But Happy does say that even if it was for 24 hours, it means the world to her because no one treated her the way Chintu did.
And that's true. What Rocky and Happy shared was Mere Naam Tu'. He always wanted his Haq' . Back in the drunk Holi bedroom scene, he requests her - itna toh Haq hai na mera?
Happy replies confidently- Pura Haq. Ekdum Pura Haq.
She gave him that! That Mere Naam Tu' Wala Haq.