What does it mean to lose someone?

Losing someone doesn't necessarily equate physical death.
Losing someone could mean a faded friendship.
Losing someone can mean not talking to him or her for months and then reconnecting but knowing you'll never be close to that person like you were before. It'll be awkward and like trying to ride a bicycle again but not really. The muscle memory will be there but you'll have outgrown that bike, the training wheels and handle streamers.
Losing someone means mourning the loss of that person but have you ever thought about being mourned and not the mourner?
Would you even know if you were the "lost person"? Or would you go about your daily life never knowing and obliviously not caring?
Have you ever deliberately "lost" someone?
Do you know what it means to leave everyone behind and lose yourself?
Isn't that kind of selfish?
But we've all done that. We've ignored texts, looked at but not replied to Facebook messages, forgotten to say hi how have you been, forgotten that they still exist in life, maybe just not in your life.
How can you forget about someone????
It's so cruel but we've all done it.
I have.