@peekay I think I read it as the "last time he saw her" as in the previous time. Which if she were moving linearly in the opposite direction would be the next time we as an audience saw her. Your reading would make more sense.

I'm not sure if I'm taking things too literally, but…
River Song and the Doctor's paths couldn't actually be going in opposite directions, not entirely. If that were the case, then the second time we met River, they would have had that last meeting she talked about in the Forest of the Dead, where the Doctor cries and…

No, Paul Brittan played Johnny Depp.

First Comment
No, this is not a severely failed "firstie." This is my first comment on the AVClub.