One little note about detachment that I want to throw out there...it really isn't viable as a long-term strategy for living with someone who is addicted to alcohol. So you've stopped bugging him about his drinking and he received that information. As a result, he has expressed to someone else that you seem okay with it now. That's information for you. He's telling you who he is and what his plans are. What are you going to do with that information now?
"Nothing" is an acceptable answer, BTW. But it is also a choice.