Material stuff is valued differently by each person. Something that means the world to one can be just another thing that another wouldn’t think twice about. This shouldn’t come as a surprise, as it’s very obvious or at least, not hard to figure out.
But when there’s good news, pretty much everybody reacts the same, with enthusiasm of some sort (if not externally, definitely internally), even though values are different. You know this. You’ve seen this in documentaries about how innate certain desires and emotions are in humans.
So, if good news is related to the things we value the most, then it just means that who we share the good news with are people who we trust and/or care about. It’s safe to say that you can’t go wrong with measuring your relationships with people with the urgency you feel inside when there’s good news.
Sharing your past might mean that you have strong ties with someone, but it can’t be the defining factor. Because again, the meaning of the past is different for people. But the future is something people want to guard and save. And news about one’s life is basically a sign and a bridge between the present and the future.