I don't think this is something you can just accept. I could go into a lot of reasons why in detail, but I will just duplicate the posts of other people, so I'll focus on one point alone.
You are between a rock and a hard place. Separating, moving house, visitation rights, all of that. It's not something to handwave away. So you might decide not to rock the boat, and accept that you married a former heroin addict, and think of alcohol as an acceptable addiction.
Except, if you go down that route, that one isn't easy either. I am the daughter of an alcoholic. I don't know how far back it went, but certainly since I was 7, funnily enough, because that's when I remember realising that every evening she became... erratic and stopped being someone I could rely on. It was quite scary actually. It took me a fair few years to work out what the cause was, and that the condition had a name: "drunk", but I noticed what was going on. Boy, did I. I can remember having a nice day with her, and thinking "it'll be evening soon, and then she won't be like this any more". I dreaded evenings, and I had to make sure I asked her for advice or help with anything in the afternoon.
And at that point, she was not even violent. That didn't start up for another 5 years.
So, this will already be affecting your son. I know this will be hard to read, but I feel you need to have some feedback like this, before you can make an informed decision.
If you adopt a light-touch approach, alcohol abuse can have profound health effects. Everyone knows about liver damage, but it goes beyond that, because the life of someone with an alcohol dependency simply does not lend itself to 5 servings of fruit and veg a day, plus 30 mins of exercise.
Additionally, binge-drinking is a risk factor for many other conditions, from some cancers to alcohol related dementia.
You, and then your son, will be the ones picking up the pieces. It's no small thing.
My mother developed a lot of health conditions, and each one was linked to alcohol. She reacted to these by drinking more, if anything.
She died this year at just 57 and I spent my 31st birthday organising her funeral.
If you want to stay with him, you owe it to yourself to ask him to seek treatment. You cannot force him to get it- otherwise my mother would be here and sober- but if you don't ask, and you stay with him, you'll wonder what might have been, once the health issues start kicking in.