Familiarity and closeness are two different phase of relationship people. In most cases people usually confuse closeness with familiarity, there are two different levels of relationship.
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You might not be close to a friend, relative, colleague or team partner, you are just bound to them because of location, occupation or their current situation. When circumstances makes people to be in the same environment with you, do not take it as closeness.
You are not close to everyone you find in the same environment with, you are just familiar with them. You only have proximity with them, which means intimacy, it is only when they decide to keep that familiarity even when they are outside your environment that you can call it closeness.
When people around you decide to maintain that familiarity even when life forces them out of your environment, that is when we know that you are close to a person, this is when relationship begins to turn intimacy. And people who try to maintain familiarity even when they are no longer around you are very few, that is why you cannot be close to everyone.
Your devotion should not be determined by your current location, don't allow that. To confirm that you are close to a person, wait for a little distance from you two, and if they are still willing to maintain that level of communication and familiarity, then you can now call it closeness.
Don't ever misinterpret closeness and familiarity, there are very big gaps between this two when it comes to relationships.