If doubt exists then the answer is there. If you felt like this move was the right thing then you wouldn't have these nagging doubts. Communication has to be there. If you cannot discuss this with your partner, then the relationship cannot grow. Without communication it will stagnate and dissolve. The first thing you have to do is talk to him. No complaining, no accusing, just ask him to take some time with you to talk and indicate that you feel that you both need couple time. Ask about his thoughts and what has been occupying his time. Listening to him is equally as important. Good luck to you both.