Daphne receives a slip of paper before every relationship — with a name and a number. The number is always how long the relationship will last. When she meets Jake and the slip says his name but no number, she doesn't know if it means forever or something she's not ready for.
Mild romantic scenes — the concept drives the story.
Skip if you dislike:
Moods: Romantic Bittersweet Magical Thoughtful
Tropes: Fate Dating Predictions Los Angeles Self-Discovery
Yes, complete standalone.
The papers are accepted rather than explained — magical realism.
Yes — the meaning of "no number" is not what you expect.