Negative emotions benefits

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Negative emotions are designed to keep us safe and to motivate us to improve our lives, just as positive emotions are.

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Negative Emotions Also Provide Information 

More often, these feelings are beneficial because they can also send us messages. For example:

• Anger and anxiety show that something needs to change and that perhaps our well-being has been threatened.
• Fear is an appeal to increase your level of safety. 
• Frustration or resentment motivates us to change something in a relationship.

Basically, negative emotions are there to alert us that something needs to change and to motivate us to make that change.