I think its much harder when youre not jealous of peoples money or posessions but you’re jealous that they seem to ride through life very easily.
For example- a girl in shidduchim can easily be jealous of someone who got engaged fast and had an easy time during the dating and engagement
A couple waiting for kids can be jealous of someone who gave birth 9 months after the chasunah
Someone who’s kids are struggling in school may be jealous of those who have genius kids….and so on
The thought that helps me is that obviously Hashem gave you this nisayon in order that you should come closer to Him. He wants to hear from you…and apparently- for whatever reason- He doesnt need to be extra close to whoever has smooth sailing in life…get what I mean? Now doesnt that make you feel better???
Maybe the other person should be jealous of YOU and your connection with Hashem!