If he's not willing to talk about it, well what's the harm in leaving him believe what he wants? He's not affecting anyone else, leave him be.
"Great spirits have often encountered violent opposition from weak minds."
Einstein
When I was 5 years old, my mother always told me that happiness was the key to life. When I went to school, they asked me what I wanted to be when I grew up. I wrote down happy. They told me I didn't understand the assignment. I told them they didn't understand life.
- John Lennon