The quote expresses the importance of trust and openness in long-term relationships. It highlights how significant it is to confide in one another, especially when a friendship has lasted for over two decades. The speaker emphasizes that keeping secrets can undermine the bond they share, suggesting that genuine connection requires honesty and vulnerability.

In the context of the book "Can You Keep a Secret?" by Sophie Kinsella, this sentiment reflects the central theme of communication in relationships. By fostering an environment where both parties feel comfortable sharing their thoughts and feelings, they can strengthen their connection and navigate life's challenges together.