OP you have my deepest sympathies, and it's not selfish. Both DH and I have experienced depression, but not severely or for long periods while we have known each other. I grew up with a mother and I look back with horror on the complete and utter draining power that her mental state had on the whole family. It took over and entirely controlled all of us. And it made it a million times worse that she never had any desire to help herself or be helped. In my twenties I also had a (very unpleasant) partner with MH issues who refused to do anything about them ever.
It's not the done thing to say, but I feel I have enough first hand experience at both ends of depression to be able to...people with depression can be incredibly selfish and lazy. My mother is an extreme case in all aspects of her life, and with her MH issues becomes a total draining monster. DH and I are both far more self reliant and resourceful and recognise that absolutely nothing ever got any better by laying about doing nothing and refusing all help (yes, sometimes this is all you can do, but you cannot do this for years on end without cease). Well you can, but you won't get anywhere and if that's what you choose to do, knock yourself out, but if you expect others to stick with you for the ride, you need to start considering them a bit.
Just because someone has depression doesn't mean they're beyond reproach, and it doesn't mean they suddenly become all the clichés...brave, stoical etc. My mother is a helpless, selfish, self-destructive, passive, negative whingebag pain-in-the-ass and being depressed only makes this worse. It doesn't make her just an innocent victim. It makes her a pain in the ass who has depression.
Sometimes people need a stern talking to, threats etc even if they are in the midst of great pain.