When my step son died, very suddenly, no warning, Cardiomyopathy, my husband was inundated with heartfelt letters, phone calls etc. bar one of his business partners, not someone he saw on a day to day basis, situated in another town over 60 miles away, Of course he was aware of the situation, o/h took a month of so off in the aftermath. The partner simply acted as if nothing had happened when he saw him again. My o/h said "I know some people don't know how to address such situations, but I found it most odd, not a word absolutely nothing" and it did colour his attitude towards him somewhat. When our next door neighbour found out, they were an Iranian family and the mother tended to be overwrought and emotional at the best of times, she literally broke down and my husband had to spend more time comforting her than she did him. Thereafter for a while, she kept sending us all sorts of stuff bouquets of flowers, tins of biscuits, home cooked Persian meals, the absolute polar opposite to the icy cold partner, and his "lets not even mention it" He was a fully formed adult, so not to just say "I'm so sorry for your loss" and leave it at that astounding 