We went to London at weekend and dP drew out £40 from the cash machine for lunch. I've since looked at the bank online and noticed that everything that day was paid for in card. Furthermore, the bank is looking rather unhealthy so I merely said "can't understand what we did with that £40 because everything was paid for in card".
I wasn't accusing or asking him to explain it or anything silly like that, just merely mentioning the fact that I couldn't even remember spending it. (actually I was hoping he'd say we still had it!).
So he took it totally the wrong way, made a song and dance about explaining everything he's bought for the past few days and then ranted about how he works hard and shouldn't have to explain everything. I said I wasn't asking him to explain anything! Was simply commenting that I couldn't remember what we did with the £40. He carried on ranting, starting to raise his voice until I reminded him it was my birthday and I would not be getting into an argument with him on my birthday. I then left the room to hear him still banging on behind me.
AIBU to think there was just no need to turn that into an argument?