Lemmon
All we have is what you share, and based on what you share your husband has consistently shown addictive behaviors, as well as abusive behaviors.
On the drinking: I have a theory that you have two kinds of people that have drinking issues. Those with an unhealthy drinking pattern, and those that are biologically and/or psychologically alcoholic.
I was the former type – the type that falls into a pattern of use that isn’t healthy or sustainable, but can be quite easily changed. At a young age, I realized that I was having a beer with my friends after practice on Tuesdays, went out for a couple after practice on Thursdays, again to a bar with friends on Fridays, had a couple after games or while watching a game on Saturdays, followed by a night out, and again some beers on Sunday watching a game. One day I somehow managed to understand how stupid this was. Basically went sober for some months but have since been able to drink without it ever being an issue. I have never experienced an overwhelming urge or need for alcohol, but I do enjoy a cold beer or a good gin.
Then there is the alcoholic. That screaming need/urge ensures that my decision to go cold-turkey will seldom if ever work for him. They can’t do a "course", unless that course is detox. They need a long-term program, and to-date the best one I can think of is AA. In a typical AA meeting you will have members ranging from one day sober to several decades sober. It’s more a lifestyle than a course. That lifestyle is learning how to live with their addiction while not feeding it. Something that probably only a fellow alcoholic might understand. I know I don’t do so fully. They don’t enjoy a cold beer or good gin – they NEED it.
You say he took an alcohol course... My life has been heavily impacted by people dealing with addiction. Some have managed to live with their addiction in a controlled manner (i.e. have attained long-term sobriety), some are still active (i.e. either use regularly or take benders) and some have taken the ultimate "cure" and passed away from alcohol/drug related issues. These range from overdoses to accidents related to being inebriated.
Not a single one of them took a "course". As in twice a week, sit in a classroom and listen to lectures sort of course. None of them has ever gotten a certificate for finishing a course. At best they get sobriety buttons from AA for 30 days, 100 days and so on. My best sober friend who has been sober for over three decades still talks about how he needs to remind himself about his sobriety.
At best, your husbands course could have set him off on the path of recovery. But a single course with a start and end date wont keep him there...
His actions regarding the former AP also indicate addictive behavior. We often compare infidelity to an addiction. That comparison only goes so far, but what he is doing indicates he’s addicted to whatever kick poking at her gives him.
It’s "innocent" and all that – again it’s like an alcoholic maintaining that the single beer he had with lunch doesn’t mean he’s off the wagon.
Our experience here shows that while there is any form of contact the affair is still alive. My experience and the common perception of those dealing with alcoholism is that while there is consumption there is still active alcoholism.
I guess what I’m trying to get across is that although he took a course then if that’s all, chances are he has a bottle at the office, or stops on the way home for a beer, or has one hidden in the garage. He’s not planning sobriety, but rather his next drink. He thinks he can hide it and that it’s all innocent – sort of like the ongoing contact. Chances are he can...for now.
Regarding the sexual harassment issue.
It’s not any less serious in the UK or Europe. The big difference is that in the USA the company can be held liable and sued if they can be shown to be aware of the situation and/or not done anything about it. Plus, the employee has a strong case for wrongful dismissal if fired. The threat of litigation is less in UK/Europe, but can cost all sorts of certification, union, and reputation-issues that companies want to avoid. Bottom line is that it’s bad business.