Anon, are all emotions experienced a result of evolution or are they a byproduct of key emotions that developed as a survival mechanism?

The trait of jealously was useful in the past. If you were a Hunter and you saw your neighbor catching more game. Jealousy would encourage you to think of better ways to catch more game. The other option could be war & theft however that would not be economically feasible, as humans are social creatures. During the Hunter Gatherer Age, if you did not stick with your tribe, survival would be challenging.

Jealousy in the digital age is a useless harmful trait. Understand that those that play 4D chess understand what jealousy, envy and greed is and can manipulate it for personal gain.