The substances aren't helping but unfortunately I'm afraid your AS had some existing character issues. I'm seeing similar behavior from family. The substances amplify many a problem including using self control and discipline to show respect. If not for hardcore use of substances he would be a much better individual but he already showed poor decision making or no impulse control by using them to excess.
Depends on relationship with girl friend but maybe try talking to her expressing your disgust with your AS might give her incentive to leave or change her responses. Delicate situation that must be navigated carefully for safety reasons.
PEACE