If your husband has DID, and he doesn't remember doing this- it's probably because he DIDN'T do it. DID means that there are other personalities that share your husband's body. They take control of the body at different times and they all have their own ideas about what they want to do and how they want to be. I know it may be hard to wrap your mind around this, but maybe you could read a book on DID, and then get a better feel for it.
What I'm basically saying is that it may not be anything for you to "forgive" because your husband wasn't the one doing it. It was another personality in his body that you don't even know.
Maybe you should visit our forum on dissociative disorders sometime, just to look around and see others with DID? Only if you feel it would help you see your husband (and others with DID) in a different and compassionate way.
NOW, all this is NOT to say that I don't feel for you. I certainly do. You are in a VERY difficult situation, and my heart sincerely goes out to you.

(((((hugs))))) if you want them.
Angela