I don’t know whether to have my bf move in or stay living separately?

My boyfriend and I have been dating for 4 years and have lived separately the whole relationship. We’ve been talking about him moving in with me to save money since we wouldn’t be paying double bills but I keep going back and forth in my head. I’m just thinking that I might miss having the whole place to myself since that’s how it’s been for so long. What are your thoughts or suggestions?