for me, friendship never ends.. even when people grow apart from each other, the feeling of being friends is still there.
the categories you said, it differs from person to person.. but a friend for me is someone i can be silly, serious, dumb, be weird with, not see or talk to her for years but when i get the chance to do so, it seems like it was just a day that i havent seen her (the comforting feeling hasn't changed), and .. its not about how she trusts me, its about how I trust her. :)
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"What they see and say about me does not define who I am in reality. What’s perceived is a mere surface, what’s said is mere opinion; for what’s inevitable is hidden within the depths of my soul. Only I can tell my own authenticity."