I discovered my ex was having affairs w/men when I saw his text messages to/from men. From what I saw he was also on an app as well.  I've confronted him, but have not told him HOW I know.  Not until I said one of the names of them men (the only name I know from all of text messages), did he confess. But says that was the only man.  Not once has he asked me how I know.  I press on that I know there are more and he still denies.  Why would he not ask me exactly how I know?