Why are people jealous when they have so much more?

[Doris82]

I'm so annoyed. There's this person I know who constantly moans about work and yet they go on one holiday abroad after another. They should be grateful for being employed and for being able to go on holiday in the first place. I'm disabled and I can't travel and I said to this person that I'm going to get some new clothes and a wave of jealousy came on her face.
How can this person be jealous of me when I have a serious disease like cancer and yet they go from one holiday after another constantly?
Some people are so selfish and childish, saying they've not been able to go on holiday for a few years because of Covid lockdown. Well what a shame, I've not been away for 20 years, I have asked friends to go with me on holiday and they have said no. I have no family and I am having cancer treatment long term.
It made me so annoyed that a person who constantly travels can begrudge me a trip to buy some clothes, a lot of human beings sicken me so much.

It doesn't sound like this relationship is healthy at all, I'd cut ties if I were you.

Life sounds very difficult for you, and I'm very sorry you're going through this. But that doesn't mean others have no right to complain about anything, or that they have to be grateful for being employed!

Similarly, if she's begrudging you new clothes, it's just toxic from all angles. You're not gaining anything but jealously from spending time together, so stop.

I completely understand your frustration. It can be incredibly hurtful when people with so much more seem to be envious of what little you have, especially when you're dealing with something as serious as cancer. It sounds like this person may be more focused on their own insecurities or dissatisfaction with their life, which can make them project negativity onto others, even if they have more material comforts. Jealousy often stems from a sense of personal dissatisfaction, and it doesn’t always make sense when viewed from the outside. While it’s tough, remember that their jealousy is a reflection of their own issues, not a judgment of your worth or struggles.

I am not sure how a wave of jealousy comes over someone's face.

You can have all the holidays in the world but still have a moan about your job though.

In your post alone you have mentioned on numerous occasions that they go on holiday and you can't or haven't so it sounds like perhaps you may be the envious one not them.