Tbh I'm not sure he has got depression, while not medically qualified, I'd say depression is often an irrational feeling that lasts for a long time. Being unhappy with the way your life is, ie relationship problems, job problems, issues with family are all part of life. If somebody has rational reasons to be unhappy, that can be changed to make someone better then that's not depression in my view. Kid Cudi sums up depression in his song soundtrack to my life, a persistent state of unhappiness that lasts for years that doesn't seem to change no matter what. It's why often people in developing countries are happier those in 1st world countries, they know why they're unhappy.