Why ?

It seemed such an insignificant thing. Yet Raghavan was unable to put it out of his mind. Why had Hari acted the way he had?
Flashback 5years ago. Raghavan and his wife Aandal had just moved to Belgaum. And being devout Vaishnavites, they starred frequenting the Perumal Temple in their neighbourhood. Every Friday without fail. The couple would be there, praying. Soon they joined the bhajan group there. And that's where they met Hari.
The Raghavans were childless, despite having been married for 20 years. Despite their fervent prayers. Nothing had changed. Not their barren marriage. Neither had this diminished their devotion to Perumal, who had apparently turned a deaf ear to their pleas.
Aandal had resignedly come to terms with this. But not Raghavan. He would look longingly at children, silently pine for some of his own. He would often fantasise how his life would be like, with a son, or daughter. Somehow Hari filled this deep seated need for Raghavan. The teenage Hari was quiet, studious, well behaved , religious... In short, the model child. And to top it all, he seemed to long for a father, despite having one of his own. Raghavan and Hari clicked fabulously. They joked, laughed, had long conversations on the phone , sms'ed and emailed each other, and shared big chunks of each others' lives, their hopes & dreams, worries & fears, and even their funny and embarrassing moments.
For a while Aandal was worried, mildly and inexplicably jealous; and Hari's parents too were concerned.
Years passed thus. Then there came a period of time. Both Raghavan and Hari were preoccupied with their own lives and rarely met or talked. It just happened that way. And then one day, they met. And Hari told Raghavan he had got married a month ago. Raghavan could not believe it. His son, Hari? Got married without telling him? What injustice. He looked shell-shocked. He just stood there as Hari introduced his new wife to 'Mr Raghavan', and walked away laughing with his arms around her.