The things people tell you

Went out for a quick drink tonight. Met an old(er) man who turned out to live in the same neighbourhood as I. In less than an hour he told me that he has a child with a woman he met when he was young, and that his daugher is married and lives a good life in St Gallen. He told me about his first wife to whom he was married 11 years and now has no contact with. His second and current marriage is with a black woman who lives in Paris. He lives as said in my neighbourhood in Zürich. Why do people share these things? I have absolutely no idea, except for that maybe I'm a good listener and not afraid of asking questions...