I am a mild stutterer and my wife doesn't stutter but extra shy. So I do most of the talking and the chores related to speaking to others, i think I am even more social than her, but both of us are rather introverts. My suggestion is to figure out what he wants, reassure him that you are willing to help him with anything that might cause him anxiety (stuttering). Also don't be a control freak and try to always talk for him, i think i would find that extremely frustrating to have someone talk on my behalf. I got lucky finding my wife. In college, i would talk to random girls sitting by themselves in the cafeteria, one of those girls I married :) Over a decade later and two kids later, we still madly in love. Good Luck!