“The search for a formula to explain why some relationships flourish and others fall apart has taken many forms. Today, that framework is known as attachment theory….. Studies have shown that the key to the success of a relationship is security — because trust, emotional safety and confidence in each other create the foundation for honest communication, deeper intimacy and lasting commitment …. Attachment styles reflect expectations and behaviors that can shift over time. While longitudinal studies show that they often endure, they are not permanent …. Neuroscientists have found that the brain remains plastic throughout adulthood, meaning repeated experiences of security can reshape the neural circuits that govern fear, trust and emotional regulation. In time, what once felt threatening can begin to feel like home.” “Attachment Theory & Couples.” Washington Post (July 30, 2026).