This shows how much their relationship has grown. The girl who was afraid to even call him her boyfriend is professing her love out in open without a care for the world around. A girl who shied away from any physical proximity held his hand in front of everyone. I also loved how Naina never thought about her own humiliation and her only thought was about Sameer.
Sameer did calm down a bit listening to her, this shows that she is the only one who can control the impulsive side of Sameer. All he wants is her love and attention. Its only due to Visakha's words that he has started feeling insecure else he was pretty confident of Naina's love for him.
I hope that Sameer will look past his anger and realize that Naina is a victim and they will give it back to Kartik together.
This is a really sensitive track and I hope cvs handle it accordingly.