'When she's OK
Then I'm alright
When she's awake
I'm up all night
Nothing really matters
Nothing really matters'

The Doctor walked through the TARDIS, now and again turning around to look behind him. Even though he knew that there was no one there, he still had a feeling that maybe, just maybe, Clara would be there. Sometimes he'd hallucinate; he would think she was there, but he knew that, in reality, she wasn't. She was a ghost now.

'I see her face
And in my mind
I seize the day
Whenever she's nearby
It's like nothing really matters
Nothing really matters'

All he could do was think about her. It had been years. For her. For him, it had been decades. He could never find her, and that made him worried. What would he become? Without his Clara, how would he be a good man? How would he…how would he know…

'She completes me
How she reads me
Right or wrong

It's so clear she's
All that I need
All I need'

Clara always knew what was best for him. She always knew how to make him smile, even when something was really, really wrong. And, even though he would never tell her, he always felt whole with her. Empty when she was gone. From one extreme to the other. He just wants her. He needs her.

'I know what it feels like
I know what it feels like
Swimming through the stars when I see her
And I don't need air cause I breathe her

I know what it feels like
I know what it feels like
I breathe her
I breathe her
Every time I see her
Every time I see her, oh'

Every time The Doctor remembered his Clara, he felt breathless. Even in the stars, which should have been the breath taking moments, he focused on her face. Taking in all the beauty that it held. He always felt a smile when he remember her being angry; her short temper matched her height and he found it adorable. Just like her nose.

'When I'm lost
And need a sign
She leads the way
And I'll be fine
Nothing really matters
Nothing really matters'

SHE was the one who saved him at Gallifrey. SHE was the one who had kept him close, had stopped him from killing innocent people. It would have been a pleasure to share his life with her. But she guided him too much; he couldn't carry on without her. He was her star. His star to his Jerusalem. To his haven.

'She completes me
How she reads me
Right or wrong

It's so clear she's
All that I need
All I need'

He knew it was her. He would wake up and his first thought would be Clara. Before he went to sleep, his last thought would be Clara. Her chocolate brown orbs, her long flowing locks, her mouth…

'I know what it feels like
I know what it feels like
Swimming through the stars when I see her
And I don't need air cause I breathe her

I know what it feels like
I know what it feels like
I breathe her
I breathe her
Every time I see her
Every time I see her, oh

Every time I see her, oh
Every time I see her, oh'

He thought living was for her. He could live from her. Her happiness, her sadness, all her humany-wumany emotions. Her ideas, her plots, and her strategies. They were his too. Everything she loved, he loved. She was his source of life.

'When she's OK
Then I'm alright
When she's awake
I'm up all night
Nothing really matters
Nothing really matters'

The Doctor walked through the TARDIS, now and again turning around to look behind him. Even though he knew that there was no one there, he still had a feeling that maybe, just maybe, Clara would be there. Sometimes he'd hallucinate; he would think she was there, but he knew that, in reality, she wasn't. She was a ghost now.