Where the fuk is my break

So my bf decided he had a "bad day at work on Friday" so he's taking his son fishing because "he's tooo stressed" leaving me with our daughter, my daughter and his other 2 kids plus I'm 8 months pregnant now I'm stuck figuring out dinner since he said he was cooking amongst other things but ummm excuse me gee it must be so nice to just be able to up and leave for some me time I'm a sahm I don't ask him for anything he really doesn't do anything around the house and never has he said to even take an hour to myself am I being unreasonable for being pissed about this maybe it's my pregnancy hormones but I think this was a dick move