Well being that you live so far apart, he may just want you as a casual hook up, or casual fling, like going to visit him every now and again just for a good time. Obviously this can't happen if you are dating someone, but if you're single, and you're okay with it, then I'd have some fun, keep it casual. If you think you will develop feelings for him, and in turn get hurt when he doesn't want anything "serious" then you should ignore him, stop responding to his messages, and move on.
May the wind always be at your back and the sun upon your face. And may the winds of destiny carry you aloft to dance with the stars