Are you a jealous person and if so why and of whom?

What would give you reason to be jealous? What do you do about your jealous issues. How do you handle it? How does the person you are jealous of handle it?
Personally I think jealousy is more about you than the other person. If you are secure with who you are, there is no reason to be jealous. It is a wasted emotion all the way around. But I would like to see your point of view. can you convince me that jealousy is a correct emotion at any given time?