Do you believe some people leave your life for a reason?

I wondered that at times and asked what caused that to happen? Why couldn't i say goodbye? We had a good friendship and or relationship. How did it just end and go away? It makes me sad because i experienced this with a childhood friend and crush and we never got to say goodbye since i moved and i haven't seen him since then. didn't move far but still i wonder what could've been and often think about him.
Do you believe some people leave your life for a reason?
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