I don't let my girlfriend rearrange the living room
Do you have reasons why your not letting your girlfriend move anything around?
I like to do things my way. I'd rather her not interfere.
Wanting to do things your way is fine but when you live together you should try to compromise for each other. Not letting her rearrange your living room is a bit controlling. You should try rearranging it together instead.
Compromising sounds like middle ground and I want it my way. If she can't handle that then she's not right for me.
That is unfair for her though. If she lives with you she would want to move things around to suit her needs as well. It's bad to not allow your girlfriend to rearrange your house.