I don't make the rules, I only fix the mess that they made, like the Meg Ryan Tom Hanks Trilogy which came in a DVD box set together.
After the events of joe vs the volcano they become traumatized and both get amnesia and live their own lives and forget their names which later sleepless in seattle happens and they meet and fall in love again through the radio but after the movie ends the kid from that movie dies they separate as they willowed in darkness and change their legal names and try to move on, chatting online they accidentally meet each other fall in love only to realize it's them, they don't question it since they know it's true love and Tom Hanks and Meg Ryan live happily ever after.