Hi, Seekinghelp,
I'm from the alcoholic side - so I've been under the influence more times than I can count and I've done wildly inappropriate things when drinking. Alcohol highjacks the executive function of the brain and lowers inhibitions and in cases of extreme intoxication or long-term alcohol abuse, it causes blackouts - where the drinker doesn't even remember what they did.
I don't know where on the scale your husband falls obviously, but as long as he is drinking you can expect this type of behavior - and worse.
You don't owe these women any explanations or apologies - you did nothing wrong. I would just say, "He's a drunk."
I hope you can find a way out of this. When I was living with and engaged to a serial cheater, (who wasn't an alcoholic) someone said to me, "Why don't you cut your losses?"
That's just what I did and my life improved 10,000%.
