^^^ But thats just it you two saw each other, they won't even see each other for at least a year. It sounds like this guy is reclusive and expressed interest again before leaving so that he wouldn't be lonely while in China. Perhaps if the original poster had been in a strong healthy relationship before he moved it might work and might be worth it, but that is a might big "might". Most relationships wouldn't survive a year with no contact.
...one can be sure of nothing until it has already happened...