Attraction can work in many ways: it can be from a glance (love at first sight,

Attraction can work in many ways: it can be from a glance (love at first sight, at some call it) or it can develop with an unlikely person over the course of time. Many factors influence whom people are attracted to. They include physical attractiveness, proximity, similarity, and reciprocity.
One powerful predictor of whether any two people are friends is sheer proximity (Myers, 2018). One of the reasons why proximity matters to attraction is that it breeds familiarity; people are more attracted to that which is familiar. Proximity can create mere-exposure effect; the more you see the same stimuli, the more you will like it. People like those who have similarities with them. Friends tend to be similar on many characteristics, including personality traits.
When asked what makes a friendship close, individuals name frequency and duration of interaction as well as engaging in mutual interests (Dominguez & Hall, 2020). Most of us would prefer to think that we love our friends because of who they are, not because of the ways in which they support who we are. Joint activities, particularly if they highlight mutual interests, increase the frequency and duration of interaction, which are both important parts of friendship development
Myers, D. (2018). Social Psychology (13th Ed.). McGraw-Hill Higher Education (US).
https://full-bookshelf.vitalsource.com/books/9781260140569
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Dominguez, J., & Hall, J. (2020). Examining context shifts’ effect on relationship trajectories in friendships using Turning Point
Theory. Journal of Social and Personal Relationships, 37(6), 1892-1909.