I have one of these too!!!
In many ways, we're polar opposites. He has no family, I have a large extended family who I see regularly. He doesn't socialise and has no friends that he sees, I see mine on a very regular basis. He would never go out to see a mate for a drink; I would be bereft if I didn't see someone for a coffee or dinner a few times a month.
He's completely unbothered by it though and seems very happy. We do our own thing.
The only problem on the horizon is retirement.
He would be happy to stay pottering about at home. I want to travel, have adventures, try new things.
I've had a few weekends away with my best friend (F if you're wondering). If DH gets arsey, I politely ask if he wanted to visit said place. When he says 'No, not really.' I say 'We'll, there's your answer then. I do.'
He's never stopped me going anywhere but if this is what retirement will look like, then we may have to have a few difficult conversations.. ☹️