Thinking your question is just opening the door to more lies, denial, and manipulation.
He may even turn this on you, and you will now be the crazy one.
Does he really need to validate what you already know?
Also thinking you are giving him to much power here. Be prepared, this is where it can get ugly, you are interfering with him and his first love and he will defend it to the death.
Glad to hear you are ready to turn the focus and concentrate on yourself.
Stay strong.