"I will allow you to change one thing in your past Doctor, but one thing only. You decide what negative affects it has on your future. I'll let you see what having one life to live can really be like." Said the Dream Lord.

The Doctor was a man, but he was also a time lord.

Having two hearts did not mean he had immunity to the friendships and relationships he made.

If anything, he had more room to love them all equally.

Above all else, he felt pain, felt it before he knew he'd even face it.

Every night in the Tardis, he didn't sleep, he thought of how hard it was going to be to say goodbye.

In all his regenerations, he'd gone through it. One day hello and hi, the next could be that they died.

He absolutely adored Rose, he couldn't have enough of her brilliance. And when she left him, he was distraught. Then he regenerated some time later as a new man, younger, cleverer, who laughed in the face of danger. He met a face, the first face that his face had ever seen in his first regeneration. Amelia Pond, a lonely girl with a crack in her wall. He promised to return after fixing his Tardis.

He did, albeit several years later. She looked really grown up then. Then he left for five minutes, came back 4 years later. He never really got the timing right.

By the end, when he sat on that park bench in New York reading the last page of his wife's book. He was thinking of so many things. He should have been there for her when she needed him, all those years of waiting, which she waited. He wasted so much time. Maybe he loved her more than he thought before, maybe he should have attempted to stay with them more than them with him. It rained memories and regrets. It reminded him of Rose and losing her, losing Donna too. He wondered if he should go back, if it would even make a difference. He waited a long time.

It hurt him. He followed Pond's advice and went back. He told her the story of Amelia Pond, of how it started. But he didn't tell her how it ended. He didn't like endings. He was confident he could change things. Why did it have to end that way? Why did it have to be he could never see them again?

He was going to try and change things. One less painful memory. Not let Rose go to the parallel universe? Go back to Pond when he meant to? Save Clara before she became a dalek? Stop Donna form saving him? He was firm in his decision in destroying Gallifrey, he couldn't change that. Not ever.

He had to choose.

He woke up in a field of grass in a park. He wasn't wearing a bow tie, or even a dress shirt. He had a blank t-shirt on and blue jeans. The sun was in his face and he had two things in his pockets. A cell phone and a movie ticket for a showing in an hour. He looked around, the Tardis was nowhere in sight and his heartbeats were irregular. There was only one.