According to the authors of your text, when faced with a puzzling social question, it may be tempting to ask people why they behaved as they did. Why is this not always the best way to understand social behavior

people would not necessarily know why they behaved as they did.

Explanation:

This has been proven to not always be the best option since people would not necessarily know why they behaved as they did. Many other times individuals have been known to lie in order to make themselves appear more noble than they actually are. Therefore, asking this question ultimately just provides false information that is useless and can even cause damage to the data being gathered.

intimacy, passion and commitment are the components of a interpersonal relationship emphasized in the triangular theory of love by robert sternberg.

the triangular theory of love says love can be comprehend as this componest form the vertices of a triangle.  

intimacy relates to feelings such as of closeness and connection;

passion relates the drives that brings people together, as physical attraction.

commitment relates to the being in a long-term relationship.