Dreaming you are married when you're not can represent:
Exploring the idea of what it would be like to be married
Feeling the pull of commitments or responsibilities
A particular relationship in your real life (friend, family, co-worker, etc.), since most relationships involve the same basic dynamics as in marriage (commitment, trust, compromise, etc.)
Possible dream symbol meanings in the dream dictionary are suggested. No "standard meanings" exist because dream meaning is subjective and specific to the dreamer.