When I confronted my H with proof I was surprised at how easily he crumbled. Be aware of what happens around you. You may be surprised to see that you are capable of handling this on your own, without coaching. I know I was surprised when I did it. Personally, I think this is a process and won't be done in just one conversation. I'm not sure that setting your feet in concrete other than to demand the affair stop immediately does you any good. A good tennis player is on his toes and ready for the next return. You need to know what you want out of this.