You are still very young and so is he. Guys at that age seem to be less likely to settle down. There could be many reasons he is confused. The advice I would give would be to keep busy, hang out with girlfriends and just enjoy being young. Relationships are so tough and if you occupy your time it won't be on your mind as much. It may also help you grow and change how you feel about a steady, live-in relationship. Like you said, give him some space, if he decides he would like to give it another try and YOU are too, then see where it goes from there. Just because it doesn't work with this guy, doesn't mean that you won't find one that it will.