Final answer:
When two friends discuss various topics in depth, it shows an increase in self-disclosure, leading to a more intimate and healthy relationship, characterized by mutual sharing and trust.
Step-by-step explanation:
If two friends talk about many different topics in great detail, their self-disclosure has likely increased the level of intimacy in their relationship. This sharing of personal information is a characteristic of healthy intimate relationships and contributes to a two-way street of reciprocity in the relationship. People tend to form closer, more intimate connections when they disclose important information about themselves; it's an interpersonal process that involves not only sharing but also the perception of responsiveness from the other party. Moreover, engaging in detailed discussions on various subjects often indicates a certain level of comfort and trust, which aligns with the positive aspects of self-disclosure and relationship building described by researchers such as Laurenceau, Barrett, & Pietromonaco (1998).