E.A.
First of all, nothing is your "fault." Co-sleeping with your child is a loving thing to do, not something you did wrong. Millions (if not billions) of people around the world do this, this country is one of the very few that sees something "wrong" with it. So be easy on yourself.
Moving into a new place and expecting a 19mo child to adjust to that AND a new bedroom is asking a little much from him. Take it slowly.
At this age we always would lay down with the children until they fell asleep. Since you got him a full size bed, this would work quite well, I think. But I think the first few days you should bring him in with you. Imagine how scary a strange room is at night for such a little guy! Remember that this is a *transition* for him, take your time getting him used to the new house first, and introduce the new room to him slowly: play in there a lot during the day, let him nap in his bed, make it special and "his." But give him time to adjust. I know all my little ones would follow me around all day for a week every time we moved, as if I would disappear if I left the room we were in lol! It takes kids a lot longer than adults to learn the new "lay of the land."