 There's three main reasons humans are depressed. One is to cause negative emotions to make sure you don't do the same thing again. So like if you got depressed because you were mean to your girlfriend and she left you, then it starts computing your brain that don't be so mean to the next girl you mean or she'll leave or vice versa. The second one is it creates a cry for help. Sometimes you need help and when you're depressed, other people notice it and if you have true allies, they come and they're close to you, right? And there's other reasons, but those are two huge ones. There's a couple other some.