Forum topic: Conversations in his head

I’m desperate for some advice!

 My husband has continual conversations in his head but is then convinced that he’s had the conversation with me. When I question it he says I’m wrong and we argue. It’s like he’s gaslighting me constantly. I’ve tried to stay calm and the last time it happened I reminded him exactly how the conversation had gone without raising my voice and he eventually remembered what we’d discussed. 
It’s like he has his own script that he thinks he’s said out loud but then gets angry when I disagree because I know that’s not what was said and when it contradicts his decisions, it’s extremely hard to understand what he wants me to do or say.  Any advice? Is this common with ADHD?