Being single in a dream is read as independence and the freedom to belong to yourself. Dream books also see it as feelings about loneliness, or as a time to grow without a partner.
When this appeared in your dream, what were you feeling?
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.