1. Keep the lines of communication open. If you don't know how to express your feelings and/or have poor listening skills, learn to get better at both. You can read a book, take a class, or get into counseling. Good communication requires both the ability to express and listen.
2. Don't sweep your fights under the rug and think they'll magically resolve themselves. Do your best to resolve your first argument as soon as it arises so you won't have the same argument for the next 50 years, in different forms.
3. Remember that you love your partner; therefore, you want the best for her/him. Give her/him the benefit of the doubt when you feel angry, hurt, or disappointed. Talk to your partner; don't make assumptions.
4. Don't take your partner for granted. Tell your partner every day something you appreciate about her/him and how grateful you are to have them in your life.
5. Your partner should never feel like your enemy. If they do, something is wrong; remember that you fell in love with this person. If there's so much anger that you feel like you are enemies, get help somewhere as quickly as possible.
6. Gauge your relationship. Notice and don't ignore the warning signs if you're not talking, you're less affectionate, you're fighting all the time, and you're not happy. The sooner you acknowledge you're having problems, the sooner you can begin to solve them.
7. Always remember that you have the power to change behaviors in your relationship through different tools of self-discovery. You don't have to stay stuck in unhealthy ruts.
Good, lasting relationships are made up of two conscious individuals who have the desire to work on themselves with the determination to stay focused on the importance of their relationship. They do not take their partner for granted. They have their partner's best interest at heart and, therefore, build trust with their partner. When arguments come up, they don't ignore them. They address the issues and try to resolve them. When they see warning signs that their relationship could be in trouble, they act immediately and look for new ways to relate to each other.
This can be accomplished by anyone who is willing to take the time and energy to make their relationship a priority in their life. Nurture your partnership as it so richly deserves! You can live happily ever after, not with magic, but with work, awareness, and knowledge of yourself and your partner.