It's not all the time but often enough that it annoys me and makes me feel a bit on edge.
Like today we were leaving the house and he realised he didn't have his keys. For various reasons it didn't matter that he didn't have them so I said "it doesn't matter, you didn't take them yesterday either" now I'd think a normal response to that would be "didn't I? I didn't even notice" and I'd have said "yes, they were still in the key bowl when I left". But nooo he had to double down on that he absolutely did not forget his keys yesterday. We have airtags on our keys so I made him look at the location history and of course I was right and he had forgotten them. Another time was about a DIY project where he was sure we hadn't discussed doing it a particular way and that I was being ridiculous and difficult insisting that's what we agreed. But when he came to do the project he realised all the bits he had bought matched up with exactly what I'd said.
When I pointed out he does this a lot he said that I do the same but I really don't! Yes, sometimes I forget things we've talked about but I just say "oh, I don't remember that". I'm assuming when he says that I do it too he's thinking of the arguments we've had about similar points where I know I'm right but I can't prove it. Like when he ordered me a gluten free meal on the plane which apparently I'd asked him to do but I'm 100% sure I didn't ask him to do that! I just wouldn't have done.
It's not something that happens often and he's great in lots of other ways and I love him. But there have been these 3 times in the last few months that have really stuck in my head. Does anyone else's partner do this? Why do they do it and how do you get them to stop?