I would stop reading his texts and stop talking to him. At some point while I was doing this same thing years ago, I realized I was trying to prove something to the other person. And I realized that this was unnecessary. It is life or death for him to be right and to have someone thatzcan be wrong (you). You can refuse to continue to play this game of insanity. I have lost my mind doing what you are doing. I choose serenity now.