“I thought you knew about my romantic and sexual relationships all along and were okay with it!”
Which is really a pernicious sort of mindfuckery. Not only are you cheated on, you’re apparently so dimwitted as to have forgotten you consented.
Oh right, last Tuesday, we were going to go play tennis, but you had already scheduled an orgy with Cheryl and Mike.
Betrayal as calendaring error.
“…were okay with it.”
That’s a bold bit of DARVO too. Of course you seemed okay with it — because you were UNAWARE OF IT.
No, no, he’s sure he mentioned it. Or like, you would’ve intuited it from his new haircut.
Who said the best defense is a good offense? This bit of crazy-making goes on the offensive to make you the person who misunderstood. Not them the person who deceived.
To take it further, it’s also implied, oh I thought you were cool. The sort of person who rolled with such things. But I see now that you’re one of those uptight, unsophisticated people. I mistook you for hip. My bad.
So perhaps the best response to this SSCS is to move their stuff out on to the lawn in trash bags.
WHAT ARE YOU DOING?!
I thought you knew.