Why do some successful people fear other people's success?

Why do some successful people fear other people's success?

People who fear other people's success are those who are lack self-confidence. The lack of self-confidence creates insecurity and fear of losing what they have achieved. 

Some people don't want others to succeed, even if they are at the top. They fear that someone else might go ahead of them and become more popular or wealthy. They are often reluctant to help others and try to show others the difficult path to make their journey harder. They forget that when someone's success becomes a reason for envy, your own success doesn't last long.

If you have achieved success, help others to succeed.  There is joy in experiencing success together.