Couples usually ask me if happy couples fight and if fighting in their relationship is a bad sign. I answer by saying that research shows that happy couples do fight and that fighting is normal and healthy for the relationship. I also mention that as a therapist, I am often more concerned about the couples that do not fight than those that do. In fact, if you never fight it usually means that you are being extremely cautious and this is not healthy for the relationship. Consider trying to dance together while constantly watching where you place your feet. Never fighting also usually means that these couples do not learn to repair and rebuild.
In searching for rules to fighting fair online, you could probably find a ton of websites, blogs, and articles describing the steps couples should take to survive conflict. Some of the more common rules are “stay calm” or “take a time out”. These rules may work for some couples and can provide some great structure to their conflict to prevent the fight from escalating to war. However, according to Sue Johnson, author of Hold Me Tight, there are a few things that actually work in fighting fair.
The happiest and healthiest couples, based on what we know, go and repair the rift between them after the fight is over. Knowing how to repair after a fight can make all the difference. The myth that bad feelings will just fade over time is a myth for a reason. According to brain research, your brain holds onto danger signals and negative emotions to try to protect you and help you avoid them in the future.
So the best advice about fighting is:
• Reach for your courage and your partner, and make up!
• Soothe those hurt feelings.
• Help each other to feel safe again.
It helps to talk about your own emotions here instead of your partner’s behavior. You can both assume, if it was a serious fight, that you scared the hell out of each other. When you show your partner that you care about his or her feelings, you open the door to what Sue Johnson calls a Hold Me Tight conversation. And when you can shape this kind of connection, research says that you can heal hurts and create a love that lasts.
Source: http://www.psychologytoday.com/blog/hold-me-tight/201002/fighting-fair-who-can-do-it




