OP, I understand the question and the situation far better than most might. I was once married to an otherwise very charming man who was not a full time, busy active participating alcoholic. He wasn't even a social drinker. He was a good father, a good provider, and a pretty good husband. BUT he was an occasional binge alcoholic. He would go for months, years even, without a lapse, and during those times, of course, he was very very sorry for all the mistakes of the past, he was a changed man, and it was never ever going to happen again.
And then one day, it would be a full blown bender, where he didn't stop until he had passed out and/or drank up all the alcohol in the world. Each of these occasions usually involved the police, a DUI, an accident, etc. And yes, when it finally happened that he was the cause of a serious accident, though thankfully he didn't kill anyone, we were sued for everything, including our house, our property, and my family's land that had not been commingled with him. The suit was not successful, our insurance company settled with the other people and yes, we did eventually divorce, after several years of his being sober and in AA programs. Then of course he then forgot again, and after the divorce, ended up dying in a car accident driving while under the influence.
But people always asked me, Why didn't you call the police on him when you knew he was driving drunk?" (Answer: I didn't usually know this was happening until it had already happened!) and "Why didn't you divorce him?" (Answer: I didn't want to. I had children and a life in common with this ordinarily very nice man who had one fatal flaw. It was easy to forget that flaw was there when it wasn't going on.) It is a strange and sick situation, dealing with this type of person.
It's very similar to some of the abusive marriages I see when I work with domestic violence survivors. The good part is very very good, and sometimes it lasts a long time and gives you tremendous hope that the bad will never reoccur. This, in itself is addictive. Answers, none except that yes, there is a divorce in your future. It may seem hard to do when things are going well to dump this situation, but you know the bad will happen again.