Yes, letting out a name other than your H's may seem pretty hurtful to him, I know it would take me by surprise.
But knowing you, I am pretty sure that you apologized enough times to him and told him the dream that he understood why the name came out.
Unfortunately, you had no control over this. You were sleeping and incoherent when you awoke.
Now, with all this together, you apologizing, you telling him the dream, your incoherentness when just awaking, and the fact that he STAYED, I would tend to believe that he believed you and has forgiven you.
So, with this said, it is my opinion for you to let it lie. Don't say another word about it. Act as if it never happened.
Because if YOU keep bringing it up, it is YOU who keeps this event on his mind.
Hugs to ya!
Triple J
Things were different then. All is different now. I tried to explain, somehow..........
Eddie Vedder (Pearl Jam)