Yes, I hit burnout, I believe. My ex was also an angry and tempermental person, so I could not get my words out before I was interrupted with his temper. I became anxious around him, and it only happened around him initially. Since he's gone, I still stutter if I'm tired or under stress, which is disappointing as I thought I'd be OK once I got rid of the main stressor. Did stress cause yours do you think?