Hi,
I have been trying to 'manage' my drinking for the oast three years after being sober for 7 months. I lost a 2 year relationship to booze as well, and at that point it was my lowest point. Little did I know that it would only get worse. I find with alcoholism that history tends to repeat itself and it's good to be aware of this. I'm on day 2 right now, took my current gf of 2 1/2 yrs to my meeting last night, and that really showed her a different perspective on the whole disease.
Do you go to meetings? Maybe try bringing him along to an open one?
Like I said, I've only been sober two days but I know that its hard for any significant other to believe or trust you when you're drinking. If you want them to stay you have to show them! Leave the booze behind! You will be better for it.
K