I understand that you are wondering whether your boyfriend's behavior is indicative of bipolar disorder. What you describe seems to suggest fluctuations in mood but also relationship issues.
Bipolar disorder is characterized by extreme changes in mood, from mania (abnormally and persistently elevated mood) to depression. It can be accompanied by bizarre or reckless behavior, leading to relationship, career, or legal problems. There are a number of factors that qualify a person for bipolar disorder, including the severity and length of symptoms.
Your boyfriend can discover whether he has bipolar disorder through a face to face clinical interview with a clinical psychologist or psychiatrist. If you are concerned about your boyfriend's behavior, you can talk with him about your concerns and see if he would be willing to speak a professional who can properly diagnose the issue.
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