Most Helpful Guy
His friends may have told you he has ADHD, but are they confusing that condition with bi-polar disorder? What you describe of your BF's behavior points more toward that.
It takes an incredible volume of patience to deal with someone who has bi-polar. Incredible! My step daughter had that problem. They are emotionally draining, consider themselves only in any situation, and have a difficult time in social situations.
From what you wrote, a long term relationship was not likely to work well, if at all. If they have meds, AND actually take them, people with these issues seem to do OK. The problem is they take the meds, start feeling OK, then stop, thinking they don't need them any more. OR... the meds make them "feel" disconnected, and un-feeling of nearly every emotion, so they stop taking the meds.
Most Helpful Girl
adhd does not cause the sorts of anger issues you are describing; it is a learning disability, not a mood disorder.
that said, in the past, learning abilities have been linked to mood disorders like depression and bipolar, so it's possible there is something else going on.
still, nothing about this relationship sounds healthy. i'd say you dodged an entire magazine of bullets.