Analysis of Drifting

You and I both were cut from the same cloth
It seemed as if we both shared the same brain
Memories yet haunt me, tender and soft
Like cars on the highway, you changed your lane

We were once closer even than brothers
Yet through the years of our youth, we both changed
As time moves on, leaves fall, springs to summers
So familiar were we, now estranged

Now when I say "hello" I greet a ghost
In life's journey, we took paths now diverged
Knowing who we were back then hurts the most
I've struggled to make our lives again merged
But I have changed too, a different path
Now must I let go of my other half?