Love First, Know Later: Persona-Based Romantic Compatibility Through LLM Text World Engines

TL;DR

This paper introduces a novel compatibility assessment framework using LLMs as text world engines to simulate interactions and predict human preferences, shifting from static profile comparison to dynamic relationship modeling.

Contribution

It presents a new paradigm leveraging LLMs for interaction simulation and compatibility prediction, with formal proofs and empirical validation on dating data.

Findings

LLM-based simulations improve compatibility predictions

Theoretical proof of convergence to stable matching

Empirical validation on speed dating and divorce data

Abstract

We propose Love First, Know Later: a paradigm shift in computational matching that simulates interactions first, then assesses compatibility. Instead of comparing static profiles, our framework leverages LLMs as text world engines that operate in dual capacity-as persona-driven agents following behavioral policies and as the environment modeling interaction dynamics. We formalize compatibility assessment as a reward-modeling problem: given observed matching outcomes, we learn to extract signals from simulations that predict human preferences. Our key insight is that relationships hinge on responses to critical moments-we translate this observation from relationship psychology into mathematical hypotheses, enabling effective simulation. Theoretically, we prove that as LLM policies better approximate human behavior, the induced matching converges to optimal stable matching. Empirically, we validate on speed dating data for initial chemistry and divorce prediction for long-term stability. This paradigm enables interactive, personalized matching systems where users iteratively refine their agents, unlocking future possibilities for transparent and interactive compatibility assessment.