This. I notice this with a lot of guys. Living with a female for a man can seem like he is sort of tied down and he wont have the same freedom he has now. Not to say you're going to be pinning him down but there is a difference. Most guys that live without their GFs get used to not answering to anybody and its really not the same when you move in together. And your BF knows this. When a chic and a guy live together, the guy cant stroll in late with no explanation. They want their space and they like having us around but sometimes they just want that space with no issues. Prime example, this guy I know moved out of his GF house, and now he is back to going out and doing as he pleases. That's really what its all about.