In case you weren't aware, it is entirely possible that the Doctor is the world's worst husband. Not only is he a mean, insufferable jerk, he also is exactly 41 days late for his one year anniversary.
So, he does not say anything, instead leaves lots of shiny, wrapped packages in the console room, with the hope that she might forgive him.
There is a note:
I've never been quite on time, but I never forget. Happy Anniversary. Je t'aime, The Doctor.