What does it mean when someone says it’s better to get used to your absence before you leave? cuz they’re scared I’ll cut them out?

Anonymous
He said he wants to start adjusting to my absence cuz it’s better to get used it before it happens. I’m leaving school and going to a different school for studying. That he wants to mentally prepare himself so that he gets used to me not being around.
What does it mean when someone says it’s better to get used to your absence before you leave? cuz they’re scared I’ll cut them out?
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