A first love returning in a dream is read as the memory of an intense, uncomplicated feeling. Tradition takes it as longing for that freshness, more than for the person. Meeting them unchanged is read as revisiting who you were then; meeting them older or different as seeing how far you have come. A happy reunion is taken as a wish for more openness and joy in your present life, while sadness or distance is read as old hurt asking to be finally laid down. Dream books also link first love to beginnings in general — the first excitement of any new path. It can help to notice what in your days feels new, or would like to.
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.