I'm going to be politically incorrect and claim that a part of the reason is that the information on alcoholism is misguiding.
In schools and elsewhere people get the wrong concept of alcoholism. They can for instance be told that a person is an alcoholic, if he is caught drunk driving once (i.e. one has to be an alcoholic to be drunk driving), that a three-day weekend is the equivalent of a bender, and so on. In other words, society tries to claim that alcoholism sets in on a much earlier stage than the medicinal sciences acclaim.
This leads to that quite normal social drinkers, who drink perhaps once or twice a week, and overdo it maybe every 2 months by drinking three days in a row, get the idea that they are alcoholics. And hence they think, "hey, it's not that bad", and then they think that they can drink more (they have already become alcoholics, remember?), and eventually get caught in real alcoholism.
By reducing a serious condition as alcoholism to something that one "obtains" after a 3-day drinking event, one diminishes the seriousness of the condition.
If society tells totally normal people that they are alcoholics, they actively contribute to the reason for them to become just that.
As for drunk driving, it's of course extremely wrong, but that's no excuse for society to label drunk drivers "alcoholics". It is VERY possible to drive hammered drunk without being an alcoholic. I'm not defending it, I'm just saying it's wrong to generalize all drunk drivers as alcoholics. It is completely ridiculous to sentence a drunk driver to a rehab for alcoholics, and such sentences are based on a lack of knowledge of what alcoholism really is.
If society hadn't had this urge to pin the label "alcoholic" on everyone who drinks a bit too much, we'd have a lot fewer real alcoholics.
the definition of an alcoholic is this
have you made a decision to not drink for a certain period of time & managed to stick to that decision?
if the answer is no then ask yourself this question
once you started drinking again did you drink more than you set out to drink? answer yes then you are an alcoholic?
my friend ask your ex GF these 2 questions & see what her answer is? she may thus far never tried to stay sober, so wait your time and pick the right moment to ask her!