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Maybe she is short-term in your life.
Some people are not meant to be our forever, and they come for a specific reason, either good or bad.

Best wishes dear

Surely a temporary presence...but it's her amazement that amazed me.
If you tell me to live my life, you can't then expect me not to meet a friend of yours by chance

That can certainly happen, especially when you don't know the person is her friend from start.