I ended up splitting up with past partners a year or less after moving in together. I just don't like living with boyfriends, i enjoy my own space and dont like the fact - as others have said - women tend to carry all the household burden.
My current DP and I, neither of us have kids, we are nearly 3 years in and I know I want to marry him, we are talking babies and weddings, but is moving in high on the priority list? Not really.
Neither of us desperately need to move in together. And this time of him staying weekends and visiting in the week have been me training him to carry our domestic chores without being asked, so when we do move in eventually, I wont feel the seething resentment that killed past relationships.
And when i say training, it really is, and he is aware of it! He knows when we do move in, he won't be able to fob all the jobs off on me and the expectation is he will equally contribute to chores.
It does however, not meet with my friends approval, who all rushed into buying houses together with their DPs and fiances in less than a year of being together. Sounds like hell on earth to me.
In summary, do what works for you, and take each day as it comes. Have there been days ive been desperate to live together? Yes. Did we almost make it happen? Yes. Will we in the future? Yes, probably. Do i love my own space inbetween? HELL YES!!