Most Helpful Guy
Have you said anything to him? He might not realize it's a problem. If it's been over a week and he's still doing it you should bring it up. Don't be angry about it, just mention he seems distant.
It's possible that this is the real him, though, and he acted different in the beginning because your relationship was new and he wanted to extra impress you. So if talking to him doesn't work, don't hold out waiting for him to change for too long.1