Jealousy in romance is like salt in food. A little can enhance the savor, but too much can spoil the pleasure and, under certain circumstances, can be life-threatening.
Sympathy is what you have for someone after they die, pity you have for someone when they don't have a date to the biggest dance of the year. Empathy is what I do to you when you judge me. Envy is having pity on yourself. Can you discern the rest for yourself?
Wherever there is great property there is great inequality. For one very rich man there must be at least five hundred poor, and the affluence of the few supposes the indigence of the many. The affluence of the rich excites the indignation of the poor, who are often both driven by want, and prompted by envy, to invade his possessions.