How to Be Calm when You're Jealous

culled from:wikihow.com

Method 1 of 2: Specific Situations

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   Stacy invited Amy over to her sleepover---and not you. If one of your best friends asked your other friend over instead of or without you, you're probably feeling left out. 

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   Before you freak out, think. Have you been over a lot lately? Sometimes people need a break. If you feel like you haven't been other that often, keep in mind that your friend has other friends that they want to enjoy too.
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   If you really think you are being left out, talk to your friend. Don't try to include yourself in plans already made. Just talk about how you have been feeling left out, and try to make new plans.
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   Be willing to discuss further. If your friend won't make plans with you, try to gently get to the bottom of it. Did something happen last time you were over? Did something change in your friend's life?
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   Be prepared. It might be the case that your friend doesn't want to be friends anymore. Yelling at them won't help. If you have tried to work through the issues and gotten nowhere, you have to accept the sad fact that you are not close anymore.
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   Give it some time. If you think you and your friend could reconcile in the future, make sure to give your friend plenty of space before pushing the issue.
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   Your boyfriend/girlfriend is flirting up a storm with your classmate, and you are seeing green.
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   Assess your beau. Does he/she act flirtatious in general, or is this a specific case? Constant flirtation is a habit for some people. If this is the case, but it is still an issue for you, bring it up. Avoid accusatory statements. Try instead, "I feel hurt when I see you flirting with other people." If this is a specific person he/she is flirting with, you may need to have a more serious conversation.
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   They're with you, not them. Remember that your partner choose you, and thinks that you are special.
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    Mutual trust. In general, you should date people you feel that you can trust. Give your partner a chance.

Method 2 of 2: General Steps

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   Take a deep breath. This simple action can calm you.
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   If you can smile, do it. The act of smiling makes us feel happier.
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   Think positive. Remind yourself of happy occasions with the other person. You can talk about the problem after you are feeling calmer.
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   Hide watering eyes. If your eyes start to water, ask to go to the bathroom and rinse your face with hot water. It hides tear marks.