I'm sorry the relationship didn't work out for your daughter. I respect my friends opinions here and I don't disagree but I will say - if your daughters ex hasn't been officially diagnosed, then I don't think its safe to assume he's narcissistic at this point. I agree his behavior is odd and cold. I think its more practical to cut the losses and be thankful she didn't marry him, considering his family is aloof anyways.

Another thing to consider is the strong cultural influence - often parents play a strong role in who their children choose to marry in the Oriental culture. Since his family was aloof emotionally they probably advised him to back off and this seemed easy for him since he's probably emotionally detached like them. Since he wasn't taught good social morals, he's probably not a good problem solver and its just easier for him to bail. I understand you and your daughter are hurt, but its best to cut your losses. Your daughter deserves someone better and more emotionally available who'll stick around when the going gets rough.