Talk openly about everything, especially the stuff that hurts.

If something bothers you in the relationship, you must be willing to say it. Saying it builds trust and trust builds intimacy. It may hurt, but you still need to do it. No one else can fix your relationship for you. Nor should anyone else. Just as causing pain to your muscles allows them to grow back stronger, often introducing some pain into your relationship through vulnerability is the only way to make the relationship stronger.