Why do people youve turnt into bestfriends with go past where you first met and just get happy and remember? Even 2-3 years down the line?

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Im basicslly trying to ask if it means anything? Or if it happens with anybody, or if you have to mean something to that person?
Why do people youve turnt into bestfriends with go past where you first met and just get happy and remember? Even 2-3 years down the line?
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