An open relationship in a dream is read as questions about freedom and commitment. Tradition sees it as the wish to keep a bond while making room for parts of life it does not cover.
Does the traditional reading fit your dream, or did it mean something else to you?
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.