I am in this same situation myself. I run 2 real estate related businesses and my wife wants nothing to do with either of them. I am a full time investor now, work from home, and can set my own schedule. She loves that. I've tried to get her interested and involved but realize that it's just not her thing. I have to be 100% ok with that, but she is also ok with me following my dreams and passion.
When I first got started I had a full time job and told her that I would have to make some sacrifices to get things going the way I planned. I also told her that it would be worth it when I was done because I would potentially be able to leave my job flying planes for the Navy, not deploy again, and be home to help raise our family. And I did that, but it took a few years. She was ok with sacrificing me due to the long hours I was putting in but it was worth it all around. I was able to build a real estate flipping and wholesaling business that runs without me (due to all the incredible people I have working with me) and I can stay home to help raise our 3 young boys.
About 8 months ago, I came to her and said I wanted to buy another company I had been working in the past few years. She knew it would be another sacrifice for a bit while I got things the way I wanted them in that company. And it was, 6 months of hard work and some sacrifice but things have calmed down a lot lately.
She wasn't directly involved in either of these business ventures or the growth of the companies, but she was. Her support was needed through it all with the kids, the house, the understanding, etc... I think that's where it needs to be. She doesn't have to love real estate or be directly involved in the business but she does need to be ok with me following what I want to do.
I think that is the start. Just because he doesn't want to be a direct contributor doesn't mean he has to be. But in order for things to work out and do well, he will need to support you in that quest. Good luck and I hope this quick story helps!