What does it mean if you never understand your dreams?

This is completely normal and no cause for concern. Dreams communicate with symbols and metaphors, so it is almost certain that you DO dream about your husband without recognizing the symbols that...

Its linked to your everyday life

The mind is quite capable of imagining vivid images of people one has never seen. Such dreams are not at all unusual. The meaning of the dream depends on what occurs in the dream.

You might have learned some of this language as a child, though you did not know it. It might be a made up language that your conscience created.

then it's a foretelling in the form of a dream, that you're about to see the movie.