It's been like that for us too, for a while I was sleeping with our daughter and my husband would sleep by himself, but now we've switched and I usually end up sleeping by myself while my husband sleeps with our daughter. I thought we would never get her to sleep anywhere else but our bed but she's slowly getting used to sleeping her own.
Oh Lord! We co-sleep because our living situation doesn't allow us to get our kids their own beds. I sleep with my kids in the bed and my hubby sleeps on the couch. It's a temp situation but I'm worried my oldest is going to get too used to sleeping with me.