Jealous? Phuk no.
I have known a number of super rich (billion plus) in my time and they are ALL miserable fucks. All they can think about is money. How to make more (for some strange reason) and how to hold onto what they have. They rarely have any real friends as they view all people as either having their hand out or about to steal what they have.
They are obsessed about being richer than the next guy, jealous of those richer than them and never ever content. Never.
One guy I spent a lot of time with had, among many, many other things, over 1600 retirement units in the US. He had multi million dollar weekender homes all over the world. He had an entire room to hold all his watches. He could blow a few million a year on crap and still die a rich man. Yet all he could think about was how to make more money.
And they are all like that.
Go down to a nice quiet beach after sunset in the summer with your better half, buy yourself a meal of fish and chips and watch the stars come out. No money can buy you a better experience.