There is a cure for depression
While many people bounce back from a failed relationship, financial difficulties or setbacks at work, some do not. For them, such events may lead to depression. But help for this condition is at hand for those who seek it.
The usual care is to see a psychiatrist to get the medicine (prozac plus others) and also a psychologist (to get solutions eg lifestyle changes advice) as well as a counsellor (to whine and let it out, often without any solutions, just a listening ear, some sympathy and she gets her salary and you get you sanity back).