Knowing relatively little about your situation, I'm not sure I can really offer adequate advice.
I will say that I don't think you should push it, if it's meant to be, let it be. The more you try to clearly define what is going on, the more likely you are to push him away, sometimes solely because he doesn't want to promise something he can't deliver on.
I think you should just continue as you have been and sooner or later it will become more clear. Plus, it's summer and that's a time to be more free and less tied down. I know that's not necessarily what you want, but it might be what he wants. Good luck figuring it all out...