I have been a sahm for the past four years.
In that time I have always been the go to parent in terms of looking after the kids when they're ill and can't go to nursery etc so DH is never impacted.
I've rearranged my life continuously for the entire time to ensure he can go about his life and work how he wishes and have been fine with that.
I've recently started a new job, just a few hours at a local shop, probably about 6/8 hours a week. I really enjoy it and feel independent for the first time in ages.
So this week our children have been ill, and now I have an ear infection. Eldest can't go to nursery tomorrow as he has a stomach bug, but I still need to go to work.
DH works from home on Thursdays and I told him at the beginning of the week it was unlikely DC will make it to nursery this week because of illness and we'll need to work something out.
I have a work shift and then I have an appointment in the afternoon that I can't miss.
He was very supportive and I felt like we were dealing with the schedule clash as a team....until he came home tonight, via the pub I might add, and told me he didn't think he should have to reschedule his day to look after DC as his job is always the "first thing to be sidelined" 
I nearly fell off my chair tbh.
I've had a raging earache and a sick child at home all day. He knew this and still went to the pub after work, and came back 90 minutes later than agreed. For openness I did say it was fine to go for a quick drink, because you know, we're a team. But it seems we're only a team when he doesn't have to help.
I pointed out that in four years I've been the go to, and in the rare case I was unavailable my parents stepped in, all so his work wouldn't be impacted. And now I need some support it's not there.
also I'd like to add he's told me himself that his work isn't that busy at the moment. I've seen him dawdling about reading the paper and tidying his office on wfh days this week and last.
AIBU to be really pissed off with this?!