Welcome tomandliv! A couple of things here.
Early on you mentioned that "he started drinking again due to some petty arguments we had". He didn't drink because of the arguments, he drank because he's an alcoholic. That's what alcoholics do...they lie, make up excuses and generally do whatever they can to blame someone else for their drinking. It is very hard for those outside to understand, and even hard for the alcoholic themselves to understand.
You've gone above and beyond to help and it's a valiant effort, but unfortunately he is the only one that can truly make the decision to quit for good. People cannot be "loved" sober or "forced" sober. I think you've made the best possible decision you could have - to take care of yourself and let him know that while you care for him deeply his behavior is unacceptable and not compatible with a relationship.
It's certainly possible that this could cause him to "see the light" so to speak, but be prepared that he may not. There will also possibly be a lot more excuses and empty promises..so be wary. There are many groups out there for friends and families of alcoholics, and we have a friends and family section here too if you'd like to check it out. Lots of poeple there have been through what you are going through and can help.
Lastly though don't ever second guess your decision....you did the right thing and you should be commended. Taking care of yourself is a very important thing to do.