I was a binge drinker at the tail end of my drinking and I know for a fact that I was addicted to alcohol. I could go months at a time and usually start out slow when I started drinking but ended up drinking way too much alcohol for myself in a short period of time.
If not addicted, then your husband is obviously compensating for some issue. I hope he can find out what it is. Hope it all works out in both of your favor.