It goes without saying that it’s easier for couples to get along when life is running smoothly. During tough times, holding on to harmony becomes more difficult. But it’s of no surprise to say that those tough times test the strength of your relationship. Psychologists say stressful events or even crises aren’t likely to single-handedly break up strong partnerships. Couples can make it through rough patches with their relationships intact. But it helps if they’re flexible, empathic, and team-oriented. The glue binding couples even in times of strife, in fact, isn’t that mysterious. Here’s what couples able to weather struggles together tend to have in common, and how to strengthen those qualities in your own relationship.