He was so alone.
He would never hear her tinkering laugh again,
never feels her soft hand in his,
would never smell her scent of strawberries.
Her smile would never again light up the room.
Her big bright smile would never make him forget his worries again.
And he felt alone.
What would he do without her?
He felt so helpless. Empty. Just a shell.
He would go back there sometimes. Visit her flat in London, thinking of all the memories.
But he would be back in the TARDIS within a flash.
Because it hurt too much.
She wasn't there to wipe away the tears running down his face.
Because she was gone.