I guess you have to ask yourself about the FACTS that happened in this short-lived dating experience.
Did you enjoy spending time with someone who was constantly under the influences of alcohol?
Did you enjoy being in a relationship with someone who was not emotionally present in the relationship?
Did you enjoy being with someone who constantly picked arguments with you?
Did you enjoy having a rocky relationship?
Did you enjoy being on the receiving end of his mean uncaring and hurtful words?
Did you enjoy having to carry a grown drunk man who didn’t want to hear about his behavior?
Did you understand that his words of “changing” were just that, words with no intention of any acitons?
If all of the above are acceptable behaviors to you then maybe you made a mistake by ending receiving all of that.
Not trying to be mean just pointing out the facts as you provided them to us.
Despite knowing if he is an alcoholic or not, would his behavior be tolerable to you if you did know for sure?
Isn’t this what dating is all about, getting to know someone to see if they fit into our life and make us happy? And when we discover these big red flags, and that we are no longer happy, that is our signal to stop dating this person.
We can’t date someone’s “potential” with hopes they will change, we have to date the actual person for who and how they are today.
In my own opinion you did the right things by ending it. Now the next step is to go no contact and block him from contacting you.