it means you keep thinking of him cheating ... If he loves you like you mentioned, then there's actually no need to worry.
And sometimes it are those worries that worsen the relationship between you and him.
Exactly what you said it was A dream---have you ever dreamt u had won the Lottery did u ? -----have u ever dreamt u were a queen were u ? LOL
It means you're falling asleep thinking consciously or subconsciously of your husband being disloyal. To me, trust is the key to a working relationship.
There's also the possibility that it's a dream, and dreams don't always make the best arguments.
you are feeling insecure
why do you feel insecure?