Who am I

I looked at the mirror, the mirror looked back at me, we both talked a while about the person we see.  
I saw his face and looked into his eyes, the mirror saw his soul and what he saw made him cry.  
"I've seen you before but I don't recognize your face, don't recognize your reason of standing in his place"
He's changed a lot I told the mirror still looking back at me
"I've lived my whole life up here on this wall yet you still see the same side of me"