Hi and welcome TiggyPig - I'm sorry for what brings you here but I know you'll find support.
I made many promises like your partner - and I meant them at the time. But I had a burning desire to drink - I thought I could find a way to drink as much as I wanted and not have bad things happen.
I believed that because I wanted to believe that.
You have to decide where your breaking point is I think. I'm sorry it's such a bleak choice.
D