You have to find out if your suspicions are true before you assume too much. I would be suspicious if he is doing these things but you have to find out the truth. You have to find out what he is doing before considering it as a distraction. You can't have this relationship continue with no trust. If this takes a couples counselor then so be it. If you think he is online there comes a point where you have to consider that it isn't working. If you think you can resolve this by discussion, counseling and compromise then you should do that. I would monitor the relationship as you have and consider ways to build trust. See if you can foster communication by approaching him when you feel insecure. Then make your decision.
If this is helpful press accept