Despite the difficult life they had, they were eachother's best friend and supported the other no matter what. They found solace in the other and missed eachother immensely but respected the other's needs and wishes, yeah they had liked eachother from the first moment itself but these small things in their friendship bloomed in much deeper love. And then, Zindagi Gulzar Hai, those lyrics matching the entire content and then the cheesy romance you have involved Arnav and Khushi in, the Rockstar Arnav and the sexy specy Khushi, loved the entire concept. It was beautiful and totally flawless. Loved every single bits of it.