My xh used to do something we called 'pass for normal' which I think is the same - act as if everything was OK, when it so blindingly wasn't - like the roof has fallen in and you sit there drinking coffee out of the best china.. . . . . and acting as if the roof was still there.
when we were selling our house I had to go over and pack stuff up and make sure everything was OK. My xh [still technically married then] used to come by and stay all day long, when my youngest son and I wanted him to just go away. Then he would leave in the evening and go back to the OW. And come over again the next morning . . . .
