You can make a point like

"THAT guy is NOT going to improve our marriage, he's making it A LOT WORSE... if you want to talk to someone, we need to work on finding a qualfied professional... THAT GUY IS NOT GOING TO HELP YOU...do you know how many people start cheating on their spouses and end up doing a LOT OF DAMAGE to each other when they COULD have worked on and saved their marriages instead?"