Because a text is a vacuum. No tone, no face, no timing, none of the channels your brain actually uses to read people. When the brain is missing data about someone it's attached to, it doesn't wait politely. It fills the gap, and it fills it from memory: every slow fade, every blindside breakup, every time you sensed something wrong before anyone said it out loud.
That filling-in process is the overthinking. It feels like analysis. It's actually your attachment system running threat simulations, and the simulations use your history as training data, not your partner.
Which is why you can reread a message fifteen times and feel less sure each time. There's no new information in the text. There's only more alarm.
