Disclaimer: I don't own Doctor Who at all. Whoever owns it (I can't remember their name), lucky for them—you can give them the credit :)
When Rose disappeared with Pete into the Alternate Universe, the Doctor wanted to pretend he was surprised. But he wasn't. He had known it would happen. At sometime or another.
It had been late at night (or to Rose, at least, there really is no night in the TARDIS. Well, that is to say—Rose had been asleep for a long time. Leave it at that.) and the Doctor had been brooding. Darkly. Darkly brooding. Something like that. He knew—like every long-living alien knows—that Rose would die or disappear or not be with him anymore someday. After all, she was human.
But the Doctor wanted to know. For sure. He wanted to know—have proof—that she would leave. So he could prepare himself. Or even, possibly, change what happened. After all—nothing is set in stone, right?
But all the same, the Doctor didn't want to know know, he just wanted to know. One word—not two. He just wanted to know enough that he could stop it, or know when it was coming, or something. So he resorted to something he never thought he would stoop to (at least by his own free-will): a human computer, made in 2010.
It was in a dark room, a long ways from any of the bedrooms—his or Rose's. But it was only dark because he was in a dark mood—and it was night time. In a way. Sort of. I don't know. It was just dark.
A little tampering using his screwdriver, and BAM!
Okay, not a bam(!). It was pretty normal. There was no sound—a list just popped up on the screen.
It was a list of the missing/presumed dead. It had no date (the Doctor did not doubt that the TARDIS had left it out so he wouldn't know what time Rose disappeared in. She didn't want him to avoid that time frame. She didn't agree with him changing the timelines.).
But there, in letters or text no different than the rest, stood out two names:
Jackie Tyler.
Rose Tyler.
To him, it seemed as if they were in bold, big, screaming texts. It nearly killed him to see those names.
He turned off the computer and the screen blacked out as he turned his face away, allowing two or three tears to slip down his cheeks before he wiped them away and got up to go to bed.
He didn't need much sleep (being a time lord), but he figured that now was as good a time as any to get some.
So when Rose disappeared, he wasn't surprised.
He knew.