It is an indicator of a lack of affection or affection. In many cultures it is a bad omen or the imminent passing of a loved one. For the vast majority, it is an indicator of positive changes in our routines.
The dream in which the protagonist is the marriage is usually a reflection of sadness. If the dreamer is married, it reflects a lack of affectivity; If you are single, it is a sign of loneliness and a need to get out of it.