1- Keep nagging to a minimum. This rarely works and doesn't help the relationship. If you need him to do something, ask nicely and with respect.
2- Welcome him home with a smile and a hug instead of a sour face. Listen to him talk about his day, especially if it was a difficult one.
3- Plan little surprises for him. They do not have to be elaborate and can be as simple as getting him his favorite snack to let him know you are thinking of him. Or, plan a surprise date night with him.
4- Give him his space. Encourage him to go out and hang out with his friends for a break or engage in a hobby or sport that he likes.
5- Cook him his favorite dishes once in a while even if you would rather eat something else.
6- Express your love and appreciation often. Find time to be intimate even though you may be tired; it's an expression of your love for him.
7- Join him in activities that he's interested in. Watching Sunday football may not be something you would choose to do, but it's doesn't hurt to show an interest from time to time.