If you two should marry, do you think a marriage could withstand years of this?
It doesn't sound like he's going to change, and you're more of an active type person, and you shouldn't have to change either.

I really don't see a marriage withstanding this very long. One or the other of you is going to get very tired of being alone all the time, especially socially. Perhaps you're already tired of going out alone all the time.

If you're already worried about it, it's not going to get better. I'm sorry. I don't have any hints or strategies. That's just the way things are. God bless and please take care. Hugs, Lee