Sometimes good guys don't respond because they are afraid to cause you more pain or they just don't know what to say. You have a lot going on in your life. I assume he is picking up on your energy and probably is wondering where he stands with you when you go to China. He might be afraid to invest too much if you will leave him when you move to China. I wish I knew my own advice when I was married to a pretty good guy, but we didn't communicate and I kicked him out of my life.
For what it's worth, I recommend you go somewhere without distractions and talk. Because I tend to monopolize the conversation I found the following method of talking that gives both parties a fair shot. You take a timer, say 5 minutes, don't go more than 10. You start the timer and the first person says what is on their mind, how they feel, what they fear. One subject. When the time is up, the person listening paraphrases what the first person said. This is to make sure both are on the same page. Once you agree, the timer starts and the second person can respond, express their opinion, etc. I know it sounds tedious, but it is a great way to address difficult things in a "civilized" manner with positive outcome. You don't have to do all the issues in one session. Pick 2-3 issues, have your exchange of ideas, feel better and go out for ice scream, share an ice scream cone in honor of Valentines Day.
I really think this guy likes you but he doesn't know where he stands with you. If you decide to try this, let me know how it works for you.
Good luck! I'm thinking of you and if you want to talk, feel free to PM me.