One of my best mates missus did was carrying on with the builder who was doing their kitchen, whilst he was having chemo for throat cancer ( doesn`t get lower than that in my eyes )
He only found out when his mum ( who`s a wily old fox ) happened to walk into the bogs of a restaurant they where all in and caught her on the phone to him.
She denied it, but his mum was having none of it and tipped off my mate.
After accessing her phone and finding all kinds on it, he set up a fake chemo session and parked somewhere out of sight, leaving to two of them on her own in the house. He gave it half an hour and let himself in, catching them on the couch in the front room ( clothed ).
The builder managed to leg it out of the back and into his van, leaving behind a half finished kitchen and all his tools ( which he never got back )
My mate comes from a family that is quite " connected " and the builder was paid a visit and " spoken too ".
At the divorce proceedings, the court quite rightly took the side of my mate and he did very well out of his divorce settlement, which was made even better for him, by the fact his ex missus was caught out lying about assets that she had tried to hide.