U haven't really spent so much time with him and it seems u're a bit overly dependant on him. Just try to take it as a friendship and nothing else, and don't expect anything from him. If a person has any interest whatsoever in another person, they'll put in the effort to keep in touch. If they don't, well u can't force them or make them feel guilty about it- it'll just push them away even more. It seems he lived the moment u had together, but is going on with his life, just as u should do. If there really is a connection and more to be lived together, time will tell. Until then, MOVE ON. Good luck, i feel ya.