Help Anniversary is today

So today is me and my bf one year anniversary. However we got in an argument yesterday and tbh it’s making me not in the best mood for today. He got upset at me yesterday because he has ADD and he was explaining to me why it’s so hard for him to focus. I told him I wish he had tried to explain to me sooner how his ADD effects him because I feel that would have explained a lot and given reason for the way he acts at times. I also said perhaps if I had known we could have had less fights because I would have been more understanding. He completely got upset and started yelling and saying well there’s nothing he can do about that now and how it’s hard for him to explain things and how I shouldn’t expect him to know everything about his ADD ( but can you blame me for thinking that he would tho,, and why is that even relevant) I just feel he was being an asshole for no reason. Then on top of that he was like oh he acted like that because of my tone.... really ?? My tone??? You could have just said that you didn’t like it and I would’ve apologized... I don’t understand him..... he’s being stupid. Now he’s here apologizing.