How does one do it?

How can you spend your whole childhood
Living a few doors down from your sibling,
Your enemy and your hero,
Your greatest foe and worst friend,
And then suddenly
All at once and out of nowhere
It's over?

Your room isn't the same anymore
The walls are bare and your bed empty
I realize I haven't seen your face in ages
And we haven't talked in months
I wish we could stay just a hallways distance away

In my dreams we are still kids
And just a few doors down