You only have to look at the Relationships board here to see that people do uncharacteristic things.
'Could I ask you ladies for a bit of advice? It's probably something or nothing but it's bothering me. DH and I have been together for a long, long time. He's always been a brilliant father and we've been great together. He helped me put my life back together after my exDP died in a very sudden tractor-related accident and I was cut out of running exDP's business with his DB 
ExDP was DH's best friend so it was natural we came together.
Just to fill in the background, I've brought up my DSD since she was a baby (DSD's DM lives abroad with her other DC and her new DP and we don't see much of her thank God. We have our own little DD and I've given a lot of support to DH's dad and his DW since they had DH's DSIL2 (menopause baby, big surprise!) and sadly she turned out to have Down's. We live right next door so it's easy really.
DSIL1 is one of my best friends although she doesn't live locally now. We don't see nearly as much of my DM and DD as they live outside the forcefield.
Anyway, another thing that's lovely is that DH and I work at the same place. I was there first so I know our boss and her kids really, really well (don't want to say too much about what we do or I'll out myself!). I was there for all of them when our boss sadly lost her DH in a very sudden roof-related accident a few years ago. It was after that that my DH went to work there. I suppose you could say he took our boss's DH's place. I hadn't thought of it quite like that before.
Anyway, DH has been really snappy recently and so has our boss. It all started after they went on a work trip together.

There can't be anything going on, can there? Our boss is really posh and DH wears a lot of polyester. Surely they couldn't have....'