An affair in a dream is read less as a literal event than as divided attention or an unmet need. Whether you are having it or discovering it, tradition takes it as a question about what feels missing. Having an affair yourself is read as longing for a quality the other person represents — excitement, attention, freedom — rather than for them. Discovering a partner’s affair is usually taken as insecurity or fear of being replaced, not as evidence of anything. An affair with a stranger is read as attraction to an unknown side of yourself. Dream books treat these as some of the most common relationship dreams, and as a mirror rather than a verdict.
Has this come up in your dreams before? What was going on in your life then?
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.