Marrying someone you do not know is read as committing to a new path whose shape is still unclear. Dream books also see the stranger as an unfamiliar side of yourself you are joining with.
Where in your waking life have you met something like this lately?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.