Thankfully we had made brownies for dessert that night and he used it as my cake. To stay in the theme of "half" he put half the amount of candles on one-half of the cake. He's not only wonderful but clever!
To clarify why he surprised me with a half celebration, it is because my birthday is in December along with our anniversary and Christmas. He always feels like I get gypped because of that and we've joked about having half-birthdays and anniversaries but never have done it before.
Thanks Babe-love you so much!