The fact that he had one [a mistress] was insisted upon wherever he was known. His acquaintances resented the fact that he turned up in popular restaurants with her and, leaving her at a table, sauntered about, chatting with whomever he knew.

F. Scott Fitzgerald

The Great Gatsby. Chapter 2, Nick on how much of a scumbag Tom is. While most men that cheat on their wives would meet their mistress in private, Tom insists on showing her off to everyone and acting like it was no great deal.