The other thing, of course, is actually making time for each other. This can be a challenge while your children are young. My husband and I do this by going to sleep with the children and waking ourselves up a couple of hours later. Sometimes long car rides serve the same purpose. If we plan them around sleep or naptime, we can spend the ride catching up on each other's news and talking.
Many books have ideas for nurturing relationships.
One that comes to mind is The Couple's Comfort Book , by Jennifer Louden. Good luck to you. Remember that your work is valuable and so is his. More importantly, you are valuable and so is your marriage. Our children are five and two.