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It is a dangerous feeling, because you couldn't control your feelings and your mind. Many people are don’t like it but they were affected with this problem. A person can be jealous for Others Happiness, Proud, fame, talent or money. If you understand you, and your feelings you can handle the situation nicely. When you feel, who has lesser grade then you and he became favorite of others and you are not able to do such thing he does. You start having some feelings inside of you and you will try to convince others, he succeeds because of some other help not with his own strength. These all things happen because your heart is not in your control. When you get Jealous some time you will recognize but you will try not to believe you are Jealous. Realize you are jealous and try not to be.