Romantic relationships activate a process of psychological attunement whereby self-esteem becomes responsive to the romantic bond, thereby potentially benefitting relationship quality and bolstering self-esteem. Yet some people are romantically single, raising the question: Do single people also exhibit psychological attunement? In a 2-year longitudinal study of young adults (N = 279), we test whether singles psychologically attune to their friendships. Multilevel modeling revealed that within-person fluctuations in friendship quality predicted within-person fluctuations in self-esteem, and this association was stronger for singles than for partnered people. A cross-sectional mediation analysis also revealed that singles invested more in their friendships than partnered people, and greater friendship investment predicted greater friendship quality and self-esteem later on. Finally, singles maintain their friendship quality over time while partnered people experience declines. Taken together, these results suggest that singles are psychologically attuned to their friendships, and such attunement may benefit their belongingness and self-esteem.

浪漫关系激活了一个心理调和过程，由此自尊对浪漫关系做出反应，从而潜在地有益于关系质量并增强自尊。然而，有些人是浪漫的单身，提出了一个问题：单身的人也表现出心理协调吗？在一项针对年轻人的 2 年纵向研究中 ( N= 279），我们测试单身人士是否在心理上适应他们的友谊。多层次模型显示，人际关系质量的个人内部波动预测了个人内部自尊的波动，并且这种关联对于单身的人比对于有伴侣的人更强。一项横断面中介分析还显示，单身者比伴侣对友谊的投入更多，而更多的友谊投资预示着以后的友谊质量和自尊心更高。最后，单身人士随着时间的推移保持他们的友谊质量，而有伴侣的人则经历下降。综上所述，这些结果表明单身人士在心理上与他们的友谊相协调，这种协调可能有益于他们的归属感和自尊。