You have to tell yourself there is nothing you could have done. Which is true. You dont't matter at that point. Had a friend of a friend (who I've hung out with) do the same this past year with a similar scenario. With a successful business in hand and a kid. It was a selfish decision made by him who didn't care who he hurt. That's easy to move on from. I say that as a kid I grew up with shot himself over a simple gf breakup. It easy to move on from when all 3 of your best friends are now dead based on things that were out of their control. 1 murdered from playing gospel music too loud, 1 from a drunk driver while he was on a motorcycle on brice rd., and 1 from a complication in a hospital. So yeah, for someone like me......it's selfish and easy to move on from. I think about those guys all the time and what we would be doing/saying.