To dream of a marriage represents change, harmony, and obligations. You are facing a significant stage in your life where you will begin a new journey. It may also symbolize the joining of your various attributes and characteristics, especially the male and female attributes.
To dream of a marriage proposal indicates that some issue will influence you negatively.
To dream that you are getting married to your ex implies that you have come to terms with lessons and errors that you made in that relationship. You have been able to grow and discover new truths about yourself. It may also suggest that if you are in a relationship now, there are similar aspects as your previous relationship. You will not commit similar errors though. You have learned how to make changes.