I know what it's like because I see it every day. The hope that something might get better.... the vulnerability when expressing feelings... the goals being set in an effort to improve. I see it, but I know that you may not.
If you know and love someone with depression, you may miss those things. You might see isolation... negative talking... pity parties. But it's not always like that.
This is what people with depression want you to know. If you know someone who is struggling, don't shy away from them. Embrace them. Encourage them. Let them know that you care.