This title sounds like a Cosmo. Magazine, but I am actually sharing with you a list from a Holman Old Testament Commentary. 

1. Work at it

2. Think Team

3. Be Protective

4. Accept that good and not perfect is OK when it comes to your mate

5. Share your thoughts and feelings

6. Manage anger and especially contempt, better.

7. Declare your devotion again and again, and again!

8. Give each other permission to change

9. Have fun together

10. Make yourself trustworthy

11. Forgive and forget

12. Cherish and applaud.

Holman Old Testament Commentary: Ecclesiastes & Song of Songs, p319-320