anniversary date... disaster πŸ’πŸ™…πŸ½

So my bf and I have been together almost 1 year now and We were friends for almost 3 years before that. Today, just out of curiosity and as a joke I asked him if he remembered the date if our anniversary. He got the date completely wrong and tried to show me a stupid screenshot of a note he made of the date he asked me out. I'm not stupid, it was obvious he only wrote it in his notes a few seconds ago so he could screenshot it and send it to me. I'm not even sure if that made any sense but hopefully you get what I mean. He's always saying how he really wants us to end in marriage and kids one day, how much he adores me, etc. But what does that mean in his part? Is he really serious about us? Guys ere very good at chatting shit. Does he have the impression that he can do whatever he wants to work his way out of an argument? What do I do???