Could be 'dry drunk' behavior.
Stopping drinking is not enough.
The alcoholic really has to do a lot of work on himself/herself to figure out how to deal with the world without relying on alcohol and how to become a better person.
Are you sure he's going to AA meetings? Does he have a sponsor? Has he ever gone to IC?
Have you tried going to ALANON meetings?
here is a description of a dry drunk from AA:
The term "dry drunk" therefore denotes the absences of favorable change in the attitudes and behavior of the alcoholic who is not drinking, or the reversion of these by the alcoholic who has experienced a period of successful sobriety. From these conditions, it is to be inferred that the alcoholic is experiencing discomfort in life.
The self-destructive attitudes and behavior of the dry drunk alcoholic are different in degree but not in kind. The alcoholic, when drinking, has learned to rely on a deeply inadequate, radically immature approach to solving life's problems. And this is exactly what one sees in the dry drunk.
ANALYSIS OF DRY DRUNK BEHAVIOR The alcoholic who rationalizes their own irresponsible behavior are also likely to find fault in the attitudes and behavior of others. Although not denying their own shortcomings, they attempt to escape notice by cataloging in great detail the transgressions of others.
The classic maneuver of the dry drunk is over-reaction. The alcoholic may attach a seemingly disproportionate intensity of feeling to an ordinary insignificant event or mishap.
Some alcoholics who experience the dry drunk seem to know all the answers, are seldom at a loss for words when it comes to self-diagnosis. Their knowledge is quite impressive, their apparent insight, as opposed to genuine insight, is convincing.
CORRECTIVE MEASURES: #1 Go To Meeting. Those undergoing a dry drunk lead impoverished lives. They experience severe limitations to grow,, to mature, and benefit from the possibilities that life offers. They lack the freshness and spontaneity that genuinely sober alcoholics manifest. Their life is a closed system, attitudes and behaviors are stereotyped, repetitive, and consequently predictable.
Alcoholics learn early that humility and a power greater than them- selves are the bedrock for a genuine and productive sobriety. An unusual measure of self-discipline must accompany the ego deflation process. Needed is self-discipline in honesty, patience and responsibility towards the recovery process [and acceptance of their disease]. [To improve long term goals of sobriety be aware of mental stressors, get more involved in the recovery program, get active in the 12 steps, get and use a sponsor, talk things out.] Hopefully. they will begin to appreciate the ironic folly of those alcoholics who think life has suddenly become manageable again; whose sanity is beyond question; who see no need of turning their lives over to a power greater then them- selves; who find personal inventories unnecessary since they are seldom in the wrong and are no longer subject to the embarrassing need of repairing the wrongs they have done.
When dry drunk alcoholics awaken to this irony that they, still unmanageable, still powerless, are the ones who have made this remarkable "recovery," they may feel sufficiently mortified to want to change.