BRNR, I'm sorry you are having a down day today. It's understandable because the day is so special. I'm going to wish you a "Happy Anniversary" because you need to know that people care.
Whether he acknowledges the date to you or not, he does remember it and all of the other special dates as well. Don't for one minute think that everything you shared has been erased from his memory bank because they haven't. They are all still in there and it takes a lot of work to keep them at bay.
As for the affair fog, it will eventually run out of fuel and that's why they say it takes a couple of years, in most cases, for it to run its course. Just remember, he had that high w/you when he met you and once things settled down, that high settled down as well. The same thing will happen w/the ow. It can't stay in the high gear for a long time because life and what life has to offer will wear it down.
Please do something special for yourself today. No matter what, it is a very special day to you even if he doesn't acknowledge it.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.