Well getting of the whole Asian thing and to the most important point being you feel you have lost someone special….
I would advise you to do everything in you power to find him, but only if you are truly in love with him and you are willing to sit down and think about how the distance between you would work out if you were to rekindle.
I would say that sometimes things happen in life for a reason and maybe he was not the one for you. You are still very young and have your whole life ahead of you.
Also I know that you were both friends via facebook etc even though he had a girlfriend that he was in love with. But he then said that he had fell in love with you also! My worry would be that if you were with him could he possible befriend someone else and then fall in love with them!!
Very complicated situ however it seems also strange that he would just leave uni and move away just because you were not willing to accept him. Maybe a higher being has stepped in for you and made the decision for you for your own wellbeing.

Chin up and remember there are plenty more nice young guys out there. 🙂