I don't think this is necessarily a relationship-breaker, but there's a lot of scope for re-education. Seven years is a long time for him to have learned to behave like an 18-year-old. Perhaps he is simply taking you for granted. Perhaps he suspects you won't want to argue about it, as you suggested. A quiet life is a fine thing; but some arguments just need to be had, and this is one of them. You've had a lot of good advice on here, and the gist of it all is: he's behaved badly, he has a lot of apologising and learning to do. How strongly or angrily you react is up to you, but you do have to ask yourself: do I want this to be still happening in another seven years? If not, tell him so. You can't change his behaviour, only he can do that; so you'll just have to see what he does and consider what response you would find acceptable.
(Incidentally... astonishing as it may seem, some males do even give up the football and a day with their mates, in honour of their girlfriends' birthday. So it sort of shows where you line up on his list of priorities.)