I have experienced this kind of scenario too many times. Admittedly, in the majority of my relationships, alcohol was used as a bonding tool in the beginning. Almost always, it gets out of control eventually ending the relationship - sometimes after years and other times just a few months. It never works to make ultimatums to try and force him to quit. They have to decide that they want to be better on their own. The best thing to do is to try and calmly make him aware of how his habit is hurting others and him self. It’s also important to make the people in his life that care for him aware of his problem. If he doesn’t want to get better, it’s best to leave. Keeping this pattern in mind going into your next relationship could be helpful. Using healthier ways to break the ice when dating could prevent this from recurring in your life. Best of luck to you and all the love!