These categories aren’t necessarily permanent, fixed, or as clear-cut as we might want them to be—and that’s OK, says Melewski. For instance, he explains that an acquaintance can become a close friend or a work colleague who starts off as a casual friend can become a best friend with time. “On the other hand, knowing someone from childhood doesn’t always guarantee an intimate connection. Childhood friends need more than history; they require mutual support and effort.”
