Crossing over to another shore or realm is traditionally read as a transition between states — one life chapter to the next. Watching someone cross is read as accepting their departure from your life.
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.