No, punkin', I knew they didn't live together. Justin lived at Daph's. However, they only showed him there (subsequent to the reunification) during the Pink Posse arc. I don't know if it's ever even mentioned again, until Brian asks him to move in at the end of s4. So, I can see how you might have assumed he was living at the loft, because it seems he was informally living there, anyway.