Most people have trouble forgiving themselves. They punish themselves over and over and over again for minor infractions best left forgotten. In your case, what you really meant to say was that you thought your boyfriend deprived himself of a more pleasant evening which he could have had with you. You only wanted more happiness for him. This sounds like a virtue to me. The way you went about expressing it at the time could have been improved upon, which you recognized after the fact. Having made a mistake you set about correcting it, which is the thing to do. You handled it well. Next year you will do things better; you will tell him that the game is coming up and that you would prefer it if he could go ahead and take a nap during the day so he can go out with you to see the game with friends and enjoy the party. Then he will be able to get up early and go to work. Or something like that.