He will always miss her.
No matter where he is, who he's with, what adventure he's having he will always miss her.
Sometimes he misses her so much he can hardly breathe, but he always does because he is the Doctor and the universe needs him. Amy needs him.
Sometimes he finds himself angry at her. Before her he didn't feel the gap in his heart, he didn't long for it to be filled. Before her he didn't raise his head in hope when he would see a girl with short blonde hair, didn't wince inside at the smell of chips, didn't feel a sadness so strong it almost overtook him when he, Amy and Rory would find themselves in London and her block of flats would loom in front of him.
Sometimes he cries. He cries when Amy and Rory are sleeping and they can't hear his sobs. He cries at the memory of leaving her, no matter how much he wills them to the tears will not stop falling. He cries at the fact that he can't be with her but someone else is.
Sometimes he remembers. He remembers her smile, the way her tongue would poke slightly through her teeth. He remembers her hair, the way the sun would catch it and play with all the different blondes. Her remembers the way her cheeks would flush with excitement at whatever adventure they were having. But most of he remembers her eyes. The beautiful chocolate colour of her eyes, the way they would smile with love at him. Or fill with tears at his goodbye.
Sometimes he smiles. She loved him, and he knows deep down she always will. Rose will always love him and he will always love her, right until his last breath he will live for her. The Doctor-Donna will protect her. He will find her again someday, even if it's in death. And once again their adventures will continue.
