As his friend, you know his history well, and how far he's come to get to where he has been sober for three months. He's proud of that... but you also know he has his weaknesses, so you're worried that it might happen again at some point.

He's not even bothering to look at you as he speaks, which, you know, it's fine. You don't mind. As long as he's not drinking, that's all you need.