The Triphasic Model of Love: A Developmental Architecture of Attraction, Immersion, and Union

Love is one of the most extensively studied yet theoretically fragmented constructs in the behavioral sciences. Existing frameworks have clarified its components, motivational systems, attachment dynamics, and experiential qualities; however, the temporal architecture through which love reorganizes attention, valuation, and identity across development remains comparatively underarticulated. This manuscript proposes the Triphasic Model of Love (TML), conceptualizing love as a sequential yet continuous progression through three structurally distinct phases: Attraction, Immersion, and Union. Attraction represents evaluative motivational activation under rational regulatory dominance. Immersion marks a qualitative reorganization characterized by attentional narrowing, reduced evaluative inhibition, valuation amplification, and accelerated identity integration. Union consolidates these processes into stabilized reciprocal attachment embedded within relational structure. Unlike component-based or categorical models, TML delineates a developmental architecture in which passion, commitment, and attachment emerge as phase-dependent structural transformations rather than static dimensions. The model is situated in relation to major theoretical frameworks, including Sternberg’s triangular theory, attachment theory, Fisher’s neurobiological model, self-expansion theory, the Investment Model, Hatfield’s passionate–companionate distinction, Baumeister and Bratslavsky’s temporal model of passion, and the experiential construct of Flow. To address methodological challenges, the manuscript proposes operational markers distinguishing phases based on regulatory dominance, attentional exclusivity, and identity integration, and articulates falsifiable predictions regarding nonlinear attentional trajectories, phase-sensitive modulation of cognitive regulation, accelerated identity restructuring during immersion, and stabilization dynamics in union. By integrating theoretical synthesis with operational criteria and empirical implications, the Triphasic Model provides a temporally grounded framework for understanding how love develops, transforms the self, and stabilizes into attachment.