I sadly see and hear of children, young, teens and adult children of alcoholics who need to learn the hard way in order to comprehend and then exhaust all efforts in trying to get someone else to stop drinking. I think many have learned codependent behaviors and they feel the need to help, fix, mend, repair and rescue. While in that process, they shun the sober parent for giving up and letting go. Often they feel the alcoholic parent becomes their responsibility and resentment towards the parent who left builds. They need to stay in the FOG (Fear, Obligation, Guilt) for a bit in order to find their way out just like you did.
I think counseling would be a great idea for you to work all of the thoughts you have out.