I agree with frenchie. Unless he's sad and his life is in a downward spiral, which it isn't from what you described, then just leave him be. As sad as it sounds, some people need their "aha" moment(e.g., divorce, break up, cheat, etc) to fully swallow the red pill. No amount of introducing him to the forum or the manosphere will help.
Right now it sounds as if you're deciding how he should live.
Right now it sounds as if you're deciding how he should live.