Again, results of my research may not be valid for all situations and you are welcome to ignore what you do not agree with or find irrelevant.  You need to look at your specific situation and determine what is best for you and him.  Outsiders like me can only help both of you think about the issues and provide you with an opportunity to talk to a third person without getting emotional, but in the end you need to fight it out together.  Below are the five basic principles of a solid relationship: (Related article:  Do not let your marriage fall apart)

1.  Do not take him for granted

These women think of him as their 'latest boyfriend' all the time and that means that they never relax the standards for their behavior.  For them it is always like the first time.  So all the way from dressing up for him (Christina Aguilera Jordan Bratman) whenever he sees you to having some quality intimate time, they always do their best.  

2.  Give him his space

Yes, you might feel that you own him now that he is married to you but give him his space and freedom.  Men do not like to feel that they are trapped and once they feel that way they resent everything that reminds them of the trap.  Let them hang out with other guys without you (whether it is golf or fishing or drinking or even going to enjoy some entertainment), let him have his space at home (if he needs a private room for himself, and if possible, let him have it or if space is an issue he might just want a shelf or a locker that he knows will not be touched by anyone but him), and finally, let him feel that he was part of the decision.  Most enlightened men do not believe in making all the decision themselves any more but they still feel bad that a decision was imposed on them.  

3. Give him all the intimacy that he wants

Believe it or not it is the advice that grandmothers have always given but it has been forgotten over the years. A man has only a finite capacity to have intimacy and as long as he is somewhere close to his capacity, it is very unlikely that he will seek it elsewhere. Only when he feels that he is not getting enough, he is likely to actively seek it elsewhere or be tempted easily. And when I say 'all that he wants', I just don't mean frequency. I also include 'type'. While you need to discuss certain things as a couple and come to a reasonable compromise, you still need to make sure that he gets what he likes. Many male clients of mine complain that their wives will not make love to them with lights on, or not wear lingerie, or not do whatever else that they like. I understand why it might be difficult for you to do everything that he wants, you should not forget that a couple needs to satisfy their requirements in a mutually acceptable manner. Most men that I speak to say that they are willing to come to some kind of a compromise but what really turns them off is an absolute no without even an attempt to try something new and come to a compromise. Many of these men were either very frustrated with their relationships or sought intimacy elsewhere, causing great harm to the relationship in either case. Whether you will let him have the freedom to go elsewhere for his needs is a decision you need to make. Some women have looked the other way when their men have opted to go elsewhere in such cases. While I do not necessarily endorse this behavior, you need to think what you need to do if you are faced with such a situation.