Jay and I moved in together a couple of months after we got engaged (about 4 months before our wedding). We had been dating for 2 years when we moved in together. I'm really happy that we did everything when and how we did. Prior to moving in together, we each maintained our own apratments and would see each other several times a week. I never felt like I had to live with Jay to see if we could be compatible living together. I just knew we would. I didn't want to rush our dating stage of our relationship. There is something so nice about your boyfriend picking you up for a date, about him not seeing you get ready to go out, and not having to make practical decisions together. Some of the mystery disappears when you move in together so It was nice that we courted for a bit. I love living with Jay but I also really loved living by myself. I wanted to savor that because I knew in a few years with children I'd be lucky if I go to the bathroom by myself. IMHO, I think everyone should live alone before getting married as it is equally important to know yourself as it is to know the other person before you get married. Of course there is no pat answer that will fit every couple or every person