There are many pluses to being together and I speak as a very independent woman who got very used to being on her own for over twenty years after divorce. Now the children are all grown up with lives of their own, we took the plunge and bought a place together after selling both our homes.
At first I felt I had lost my bolt hole and thought constant compromise and consideration would be extremely difficult.
Now after several years I am glad I bit the bullet. My one piece of advice would be to have a room in the house you can escape to. I like different pastimes and need quiet time away from the TV etc. It's worked out really well I am happy to say and having someone support and love me 24/7 has been an unexpected bonus. We have kept our own interests and friends so I don't feel I have 'lost' anything. Having to do up a home and garden together has brought us even closer. Trust me, I dreaded leaving my nest and I did take a few months to adjust, but now I cannot imagine us living separate lives and our incomes have improved because we only have one lot of bills and upkeep.
I would however have a long hard discussion about the boat. I think he needs to realise his hobby cannot claim the lion's share of the proceeds from the sale of both houses. Have you had a serious discussion about the income you'd get from the sale of both houses?
Have you stopped loving him? Could that be the reason you are a reluctant sharer?
Whichever road you take, please remember, happiness is never guaranteed. I think you both should be thinking about plans and dreams you share when you commit to living together. Then start house-hunting (on line) together so he can see the sort of property you aspire to as well. He might appreciate his boat is a pipe dream?
Time for a few ultimatums I think, so that your lives together will work?
But please, do not throw away a decent relationship if it can be salvaged by just a little tweaking and a bit of give and take. We are all growing older and having someone to share our lives with can be a very good thing. I took the plunge, slightly reluctantly, and I am glad now that I didn't prevaricate. I am sitting alone, with my computer while he does his massive jigsaw in another room. He's just made me a coffee and on such a miserable wet and windy day I am glad (because I have considered your post and it's made me think about my fairly new situation) we are both under the same roof.
Best wishes, whatever you decide to do.