There are several reasons why someone might say you're one of their closest friends even if you don't hang out outside of work or class very often:
Emotional Connection: The quality of the time spent together matters more than the quantity. Even if you don't see each other frequently, the emotional connection and the bond you share could be quite strong. You might have deep and meaningful conversations when you do meet, which can lead them to consider you a close friend.
Shared Experiences: Spending time together in specific environments, like work or class, can lead to shared experiences and challenges. Going through these situations together can create a sense of camaraderie and closeness.
Trust and Reliability: If you've consistently been there for them during difficult times or have shown yourself to be trustworthy and dependable, they may value your friendship deeply, regardless of how often you see each other outside of the usual context.
Common Interests: Having common interests or hobbies can strengthen your friendship, even if you only get to engage in those activities during work or class.
Personal Understanding: Sometimes, people feel understood and supported by someone even if they don't spend a lot of time together. If you have shown empathy and understanding towards them, they might consider you a close friend.
Introversion or Busy Schedules: Some people are introverted and prefer spending more time alone or with a few close friends. Additionally, busy schedules might limit the time available for socializing, making it natural for some friendships to revolve around shared spaces like work or class.
Long-Term History: Perhaps you've known each other for a long time, and even if you don't see each other frequently now, the history of your friendship still holds significant value to them.
Social Circle Size: Everyone has different definitions of "close friend." Some people have a smaller circle of very close friends, while others have a larger network of acquaintances they still consider close in some sense.
Personal Preferences: Friendship dynamics vary from person to person. Some people are more comfortable expressing intimacy and affection in friendships, while others are more reserved. Being labeled as a close friend could indicate that they feel a special bond with you.
It's essential to remember that friendships are unique and multifaceted, and the depth of a friendship can't always be measured by how often you see each other. What matters most is the mutual care, support, and understanding you share with one another.