I agree with lost. It's nobody's business and you don't have to explain yourself to anyone and besides, there is never a sufficient enough explanation anyway. People that don't want to understand never will. I hope it goes all right with your friend. It can be challenging to learn that we are struggling and to not know how it will be received because unfortunately there's so much stigma around mental illness, especially depression. People think it's something you can just 'snap out of' or that it's a 'choice' to not see the 'bright side of life'. Those people should be avoided. That's my experience, anyway. There are plenty of people here who are willing and able to listen, and empathize, and not trivialize what you're going through.