Aperson who cannot tolerate the idea of being alone, who has highly negative emotional reactions to relationship disruption, and who often acts impulsively fits the description of someone with personality disorder:

Borderline personality

Explanation:

A person with this disorder doesn't tolerate to be alone, and he or she will appeal to self-destructive behavior to handle the loneliness. The person makes frantic efforts to avoid abandonment, including creating crises. Borderline personality is commonly followed by depression, anxiety, alimentary disorders, and stress.

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