From BRI Breslov.org YouTube videos:
Rebbe Nachman explains that there is a huge difference between depression—that heavy, dark sadness that hangs like a heavy cloud around you—and a broken heart. A broken-hearted yearning—to make things better, to come closer to God, to fix one’s life—is a healthy response to a difficult world. Rebbe Nachman’s deep understanding of the many feelings and emotions that make up our psychospiritual reality are essential for life. Chaya Rivka Zwolinski explains.