At one time I thought he might be sociopathic, and read up on that, but then when he is sober, he seems so much better, I thought it was just the craziness of the active using and addiction.
Sadly it is so hard to tell which came first when someone is struggling in active addiction. Does the drug cause the behavior or is the person using to try to self medicate? My own personal guess is that sometimes it's a little of both...there's self medication going on but all it does is make the behavior so much worse.
It is sad...we can't change it, but it is sad none the less