Om Swami
Why do I feel jealous when someone else succeeds?
Jealousy comes from seeing your own lack
Seeing another person rise, we start noticing what is missing in our own life, and that makes the mind sad. It does not mean your mind is impure.
It is hard to be happy seeing another's progress, because almost everyone is burning at others. Often a person begins to see the shortcomings in their own life.