Believe me, many, many, many of us have been where you are now. He's not having any original ideas. It's like they read from a textbook.
Not to be the harbinger of doom, but consider the affair possibility seriously. Not saying it's happening or that it will. I am saying, experience suggests it's not unlikely. Just remember that it's all about him in his head. It's all about his issues. You're working on you. You're looking for your own shortcomings. Him . . . not so much.
And you can't control anything but you. So, time to worry about only you. What are you doing to get a life of your own back? What are you doing to protect yourself? THESE are the things you need to worry about now.