But if you're the kind of person who craves a lot of alone time or who is particular about their stuff and their physical space, it can present some challenges. And that goes double if you're sharing a relatively small apartment, home, or just a bedroom. "Coexisting in the same space can be psychologically challenging, especially if you’ve been use to having your own place. We like our stuff, we like them to be organized a certain way, we have systems and structure. When our stuff is touched, moved and our system messed with, it could feel like an invasion," cautions Dr. Kathrine Bejanyan , a dating and relationship consultant.