He's been like it for about a week. For example the kids do something trivial and he goes in a mood - I point out that it's trivial so he'll say "yes but last Thursday so and so happened and two years ago that other thing happened ... and it's nothing to do with the current event but he brings all these historical pieces of evidence together to create an argument.
Tonight we were watching a film. My phone was about to die so I put it on charge and asked to borrow his phone (we always use each other' phones) and he starts kicking off saying I've drained my phone and now I want to drain his, it's a loss take, what am I doing? He needs his phone back to take a photo of the dog etc etc etc 😳
Anyway in the film we were watching I realised the main character looked like a bloke I work with. I told DH "he looks like Mike from work" so he starts going off on one saying "oh? Who's mike? Not heard that one before (untrue), mike and his harem of women eh? Mike fan club ... " 
. Anyway I was on Facebook at the time so pulled up a picture of Mike (from a mates photo, I'm not actually friends with him) and show DH "here, don't you think he looks like the guy off the film?" So he immediately gets all arsey, moves my feet away from him and starts kicking off about "fancying mike" and looking up random blokes on his phone etc etc!!! This is NOT normal behaviour for him.
He got a shave on Friday which is really weird, he normally likes his stubble as long as possible over the weekend. Sex has has completely died also.
AIBU to wonder what the fuck is up with him or just being paranoid??