What to do?

We have been together for 2+ years. His lease is up in 5 months and we are talking about moving in together but he said that he wants to but doesn’t want to ruin our relationship because he has had bad past experiences with an ex before. But he never loved her. He says he loves me and wants to get married and have kids with me but he just wants his own space at home that he can go to and and live life since he is only 26. I don’t get it at all because I am 27 but I have a kid so I see things differently I guess. I just don’t know what to do. I am confused. It feels as if he isn’t serious about our relationship am I over reacting?