I moved in with my boyfriend stupidly early on in our relationship, which was a tad ill-advised.... Nothing has really changed about our relationship, but moving two apartments' worth of stuff into a single apartment was difficult, and we had to get rid of a lot of things.

Fortunately neither of us was particularly attached to the stuff we threw out or gave away (furniture and excess clothing mainly).
Adjusting to having someone underfoot/being underfoot all the time has been the hardest part, but that's our fault for thinking that two people in a one-bedroom apartment was an alright idea. I kind of miss having breathing room. (We're thinking about getting a bigger place, which would solve that problem.)
Those complaints aside, it's been good for both of us, I think; he's busy with work and I'm... well, not busy with anything serious, but it's nice to live together so we get to see each other closer to as often as we'd like.
Jam it back in, in the dark.