Having close friends who are successful suddenly makes us jealous. But we aren't that jealous of other kinds of successful people like say random sportspersons or astronauts. I feel that is because jealousy is a biological response shaped by millions of years of evolution. Someone close to you having more resources meant that your access to those limited resources was in some trouble. But now we don't live in those times where the tribe had limited food, mating partners,land etc. I feel mindfullness can help recognize this ape like behaviour. Over time you laugh at it rather than get agitated by it.