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Hello and thank you for your question. Because you mentioned that your boyfriend was diagnosed with ADHD, that is most likely the cause of this form of "excitablity" and overall increased self-confidence. ADHD in men will often cause increased energy, drive, and can cause some increased grandiose behavior. So ADHD would be the primary possibility for his behavior. The other possibilities could range from Bipolar Disorder or Narcissistic Personality Disorder (NPD). Bipolar Disorder can easily cause this increased energy, drive, grandiosity, etc...., but typically individuals with a Bipolar Disorder will only experience these symptoms for a few weeks than will either stabilize or go to a depressed state. You do not indicate any type of mood swing from his behavior to suggest Bipolar Disorder though, so it probably should be ruled out. NPD can also cause some grandiosity and competitiveness like you described, but usually you are going to see issues of manipulation, lack of empathy, and controlling others and you did not describe your boyfriend in that manner so I believe that NPD can be ruled out as well.
Overall if there is anything medically wrong with your boyfriend, ADHD is the cause of this behavior given the symptoms and his clinical history, but it will take a face to face assessment to confirm the diagnosis.
I hope this answers your question and gives you some guidance on this issue. Please let me know if you have any questions or concerns as I am happy to assist and support you regarding this issue.
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