According to a recent study the level of oxytocin or the love hormone in your blood can determine the length of your relationship! Researchers found that partners who have higher levels of oxytocin in their blood stick together longer than couples who have lower levels of oxytocin. For their study the team measured levels of oxytocin in people who had recently begun relationships. Six months later the couples with the higher levels of oxytocin tended to be together. These findings suggest that oxytocin in the first months of romantic love may serve as an index of relationship duration they reported.