This fairly recently divorced B list actor/actress couple had a fairly long separation because there were a few issues that needed to be ironed out before the divorce could be finalized. The first was a confidentiality agreement for both sides. For her part she had to agree not to share any details of his abusive behavior or ever imply or indicate that it was a factor in their divorce. For him, he had to sign an agreement which promised to never reveal who he caught her in bed with (A/B list actress with A list name recognition) and under what circumstances (someone watching). The main sticking point to the negotiations was which story was worth more or would damage a career more. Eventually the actress and her A list bed companion coughed up about $1M with the majority of that amount coming from the A lister.
I wish I had more information on the person watching. I think I know who it was, but don't know for sure and so don't even want to make a blind until I'm confident.