Moving in.

My boyfriend wants me to move into the new house he is buying. I want to live with him but at the same time I'm not sure I want to do that because he will be buying it himself and my name will not be on the house. If I lived there I would feel wrong if I didn't pay for something. He wants me to help decorate it and other things. We plan on getting married but not for a while. I don't want to be helping on a house that isn't mine when where I'm living now I pay nothing. I mentioned not moving in and he didn't like that idea, I think he got offended. What should I do?