I think what's angering people on here the most about your post is how you approach the stuttering as if it were a "problem" that is self-induced. I'm giving you the benefit of the doubt though, because you might not know so much about how stuttering works. Stuttering is basically like a motor/mental tick of sorts, and it happens involuntarily. It can get worse with stress, anxiety, and nervousness, but someone can be completely calm or happy and still stutter. What I suggest is for you to practice with him, "act out" different social situations, like having him practice ordering food, introducing himself, and just situations that can induce stuttering. As for him, this is pretty broad and almost silly, but he should try speaking slowly with you while sounding out every word. Basically, he's going for fluency, not speed. Cut your man some slack though! Having a stutter is hard and sometimes you can feel helpless or inadequate because of it. Just please be patient with him. Good luck!