Hi complicated.
Four months into a new relationship is a wonderful and delicate time. Love is fresh and you want to do everything you can to be there for your beloved.
However, as you read around the site and learn more, I think you will find that you won't be able to control his drinking and that the situation may not improve. He has to be willing to take the steps to stop, and no matter how much you love him you cannot do it for him.
I had a similar situation when I let a wonderful person who also happened to be an alcoholic move in with me when I was in graduate school. I ended up supporting him when he lost his job and putting up with all kinds of escalating drunken behavior. It was not pretty and cost me a great deal emotionally and financially.
Protect yourself and do no enable him because it will just allow him to stay in the disease longer without repercussions. I really hope things work out for you both and that he chooses to get serious about sobriety.