The thing is, you don't really know if the behavior is alcohol-related until they're sober for a significant period of time.
My ex husband was not an alcoholic but he was abusive, bad with money, a compulsive liar, controlling and all kinds of other negative qualities.
My alcoholic ex displayed similar behavior, which I was always quick to chalk up to his drinking, but honestly, that was my desperation and denial. I wanted so badly for it to work that I made his drinking the focal point. If I could just get him to quit, that would solve all of our problems.