I was going to put this in Money but I'm not sure that's the right place as I'm more interested in what people think is fair or how they feel than the practical side.
I'm just wondering about this theoretically for now as I'm nowhere near moving in with anyone, but I guess I might want to one day.
If you get together when young then have a family together it feels natural to share all the family money - but what about when you get together in your 50s so don't have children together? Do you share some or all of your earnings? What if he earns more, or a lot more; does he then pay for joint holidays etc. if he wants to go somewhere nice? I'd feel a bit uncomfortable about that...