Why is it that we are not originally jealous by nature but we feel jealous of only certain people not because you want attention or something but those people don't treat you nicely and that's what makes you jealous and insecure of them?
I think people do get jealous by nature but that a variety of experiences or attitudes can make it less bad or worse.
There are people who do things for the purpose of making someone or others jealous.
Many do not.
I read something somewhere once that differentiated between "good thought jealousy" and "bad thought jealousy". Bad jealousy is when one hates whoever one is jealous of. Good jealousy is more like either: That was my husband/wife and I am sorry that is now someone else's but still happy for them if they are well.....Or: I really want to be rich to; or I wanted to get a part in that play as well, but I am happy for those who did.