Why do some close friends disappear from our lives without real reasons? Ghosting?

Anonymous
I had a close friend from the earliest classes of school and university.
she found a job right after we graduated and i didn't.. since graduation she avoids me , every time i asked her to hang out she apologized. she didn't send me happy birthday msgs didn't accept my invitation on instagram.
Why do some close friends disappear from our lives without real reasons? Ghosting?
Why do some close friends disappear from our lives without real reasons? Ghosting?
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