Most Helpful Guy
It's a tricky situation. I'm the kind of guy who says that if he's not going to make any effort to make the relationship work or tell you what's bothering him, it's time to find a guy who will treat you how you want to be treated. Relationships mean that you two communicate. You talk about what's on your minds, no matter what it is.
But others will say try to make it work, maybe he's going through something and doesn't feel like sharing. If so, maybe give him a few more days. Just tell him that you're concerned. If he doesn't show any emotion about it or doesn't seem to give two shits, then move on.
I know it'll be tough if you choose to move on but in the long run, you'll feel better. Good luck.