Flight of the Conchords - 1x01 “Sally” The point is, going out with your best friend’s ex-girlfriend while you still live with your best friend… that kind of thing would be considered a little weird here in the US. Actually, it would be quite weird in New Zealand as well.
i think it’s important to note that harry feels in every sense, somber. Down to the way he dressed, really simply in all black, just a shirt and jeans, it shows through that he is still hurting but he is up there to still appreciate and show love to those who took the time amd effort to see him. Harry is one of the strongest people out there to still perform after such a tragedy, but his love for other will always win over how much he cares about himself. He puts others first, always.