A marriage should be one of openness and honesty. If you feel he is doing something you do not agree with, you should be able to be able to discuss this as 2 loving adults. If you feel he may not take you seriously, then suggest you meet for a coffee and discuss like a meeting so he knows you are serious. Be sure to outline your fears clearly and calmly, and do not let him just dismiss your concerns out of hand. Agree a compromise and make sure you both stick to it, and plan to discuss again 2 months later. Communication is the cornerstone of marriage.