Sorry it is long. I have been married to DH for twenty years, have DC, our relationship is generally good and he is a good man but there is something that is beginning to bother me increasingly, maybe it's me getting older and more irritable but I feel more annoyed about it than I used to. He basically comes out with (often quite elaborate) alternative accounts of things that are not true, although he clearly believes they are, it is not deliberate lying but his brain seems to construct scenarios that he remembers in a false way and that then fixes in his mind (and no, he is not dementing, he has always been like this and when I met him he was in his early 30s. It hasn't got worse, I have just got less tolerant I think).
It's not just when he's talking to me, and not just done for effect or a more amusing anecdote, which people do sometimes do in social situations. It happens often. And sometimes it really matters. When our (autistic) DC was very young, DH on several occasions gave false information about the development histories of his older children to medical professionals (eg saying that his older children had also been slow to speak etc, I checked with their mother and it was absolutely not true). This led to a delay in the diagnosis. When he took DC to a doctor more recently he gave an account of something having happened when I was out of the country, which was not the case, I was present when it happened. DH made it seem like he dealt with what was a medical emergency all on his own, when it fact it I was there and was the one that went to the hospital.
More mundanely, yesterday I was planning to book some flights and he said that a particular airline had previously let us down on a specific important family occasion by rerouting our flight, and so he didn't want to book with them again (it was actually a completely different airline, on a completely different occasion, between completely different cities).
Sometimes one can't prove that he is talking nonsense, sometimes one can (with the medical and airline ones I just showed him my diary and he had to admit he had remembered wrong). He can get quite difficult and insistent that he is right when you challenge him on ones that you cannot actually prove him wrong on, so I often just let them go, but I then feel annoyed. What would you do?