<human>: My boyfriend and I met through OkCupid and pretty quickly became an official couple around 4 months ago. He's a very kind, earnest Midwestern boy who's had 3 serious multiple-years-long relationships. I'm a California girl who started dating late in life and I've mostly had romantic flings that died out after 2 or 3 months.

As I said in the title, he's brought up moving in together. He knows I'm hesitant about it - I told him I thought it was too early, and I've never lived with a boyfriend before - and he took that in stride.

I also know he's serious about the issue, though. He's living with some married friends who are moving to another state in October, and the lease for the room I rent ends in September, so it does make some practical sense. However, I'd already promised to look for places to share with my sister and one of my female friends. 

My main question is... when *is* a good time for a couple to move in together? I expected the issue to be raised maybe a year in, so I was taken by surprise! I've always thought of living together as sort of practice for marriage, and considering we only met 4 1/2 months ago, I'm nowhere close to ready for that. What are your opinions? What do you guys know from experience about moving in with a boyfriend or girlfriend?

Can you succinctly summarize the text in 1-3 sentences?
<bot>: BF wants to move in together (and he has some practical reasons) but I think it's too soon. When do you guys think is the best time to move in together (either a measure of time or relationship development)?