The undine, a water spirit seeking a human soul, is traditionally read as emotion longing for form and commitment. It links to love that crosses between two very different worlds.
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.