Mickey knew the look on the Doctor's face. He understood the emotions running through the Time Lord's head, even though he refused to look up from the console and answer Rose. The look said that he had just lost someone he loved to something he was powerless against.
A year and a half ago, when the Doctor had been a stern-looking man in a black leather jacket and Mickey had been a completely normal, no spaceships bloke, he had felt that way. Watching his girlfriend run toward the man holding out his hand and looking so lonely and yet so hopeful. Having no choice but to let her go, because he only wanted her to be happy.
And now the situation was flipped onto the other man. He may have been an alien, but he was still a man. Madame de Pompadour had been gone when he had returned, but there was no way for him to go back to her. Something about being part of events. Mickey could only assume that she had passed away, because he supposed if she hadn't they would just go into the future with the TARDIS for her. But no. There was no way for the Doctor to see her again.
He gently pulled Rose's arm, mumbling something about wanting a tour of the rest of the TARDIS. The Doctor still didn't look up, but Mickey could almost see the wave of relief and gratitude sweep over the other man's body.
Mickey knew that because that's how he felt every time he saw Rose again.
A/N: *mumbles about Moffat destroying our feels years before he became head writer* This is set in the scene at the end of The Girl In the Fireplace, after the Doctor speaks to the king of France (can't remember which ^^' ) and watches Reinette's hearse drive off. I'm still crying as I write this, because that conclusion was just so... sad, heartbreaking... and so like Moffat. -_- I don't know if I'm more angry at him for doing it or RTD for letting him.