Sounds to me he is just confused in general possibly. He is at a point in his life where there are major choices and decisions to be made. As you are.
But in all honesty I think you're his comfort zone and he is yours. Maybe he wants to pursue other options and you're a ball and chain for him. I am sure he does love you but at the same time he has these options in life he wants and some of them may not involve you. There could be things out there he wants to explore but maybe he feels your holding him down. Why can't you both live your lives with no discussion of a future? Does this need to be out on the table at such a fragile time? Just live life, finish your education and go from there.
From what I see you haven't physically spent much time together as you have emotionally. Now that your there in person he may not be ready as quickly as you are.