everything is the past, the time i wrote the first line is already a history. the moment i blinked after this word is already gone, they are all in the past.
the world you know changes constantly,
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the world you knew already changed once you finish reading this line and life works that way.
so I don't see why you stress over something that happened an hour ago, or maybe a week ago, sometimes even 2 years ago. they are already in the past, simply a memory engraved in our minds, haunting us from the future.
and then we have tomorrow or maybe the next hour, a history that hasn't been written, shouldn't you worry about that?
and it's okay to look behind from time to time, just remember you are not the same even just an hour ago.