Approach with caution? He is obviously very bitter at this point and out to blame you (for getting him a gift no less!?).
He is not honest with you, his wife of X years, Mother of his child, so don't expect him to bare his soul to the therapist. Don't be surprised if he is as manipulative and un-forthcoming as he is with you.
It's important to be prepared for this because this could really hurt you. If you get in to the counsellor's office and the blame starts, it is possible the counsellor (not knowing better, I hope it is someone with extensive addictions experience?) will try to see his point of view about everything as well, while you know the real back story.
If it's going that way, it might be best to end the session there. Might not happen, just a caution.
Some of this might sound familiar?
I'd be OK if it weren't for you! Excuses Alcoholics Make
"The addict blames his addictive behavior on his significant other, usually his spouse. He feels resentful and self-pitying about the way he considers himself to be treated and uses this to justify his addiction. Since one of the commonest causes of resentment and self-pity in addicts is criticism by others of their addictive behavior, and since the characteristic response of the addict to such criticism is to escalate addictive behavior, this process tends to be self-perpetuating. The addict is often quite cruel in highlighting, exaggerating and exploiting any and every defect or flaw the significant other may have, or even in fabricating them out of his own mind in order to justify and rationalize his own behavior".
Addiction and Its Mechanisms of Defense
"Just as a powerful river finds or creates channels around anything obstructing its flow, so does the addictive process defeat the rational and ethical resistances of the person within which it is active. And in the process of constructing such alternative paths for its discharge, the addiction shapes the reality of the addict's world and his very notion of himself.
The worldview that is created by the addictive process is one that is compatible with and friendly to the interests of the addiction. Worldviews that are inconsistent with the continuation of the addiction are suppressed or eliminated. The process is usually a slow and subtle one progressing invisibly over many years "behind the back" of the unsuspecting addict.
What kind of a world view is compatible with addiction? Almost any philosophy that does not include and will not permit happiness, healthy and balanced behavior, sustaining relationships, rigorous honesty with and about oneself, and some kind of spiritual connection(even though it may not be called that). Addiction thrives best in an atmosphere of unhappiness, resentment, alienation and estrangement, secrecy, mistrust and in most cases, ultimate despair of meaning. And it cannot continue for long in the opposite atmosphere, i.e. one of happiness, emotional well-being, healthy relationships and genuine honesty. Serious addiction, therefore, necessarily points in the direction of an unhappy and dissatisfied world view, and away from the opposite, happier and healthier perspective. A happy addict is a contradiction in terms".