Love

A desire to enter, maintain, or expand a close, connected, and ongoing relationship with another person or other entity. Investment in the well-being of the other for his or her own sake. See also Triangular Theory of Love.

Reference:

Reis, H. T., & Aron, A. (2008). Love: What is it, why does it matter, and how does it operate?. Perspectives on Psychological Science, 3(1), 80-86. https://doi.org/10.1111/j.1745-6916.2008.00065.x

Hegi, K. E., & Bergner, R. M. (2010). What is love? An empirically-based essentialist account. Journal of Social and Personal Relationships, 27(5), 620-636. https://doi.org/10.1111/j.1745-6916.2008.00065.x