Also important to note, do not do nice things for someone with depression expecting reciprocity, the reason to do nice things for someone with depression is that they are your friend and their happiness pleases you
actually that applies to everyone, it's just more bluntly apparent with people in a major depressive episode
@Xibanya
I find Allie Brosh to have nailed the depression response perfectly with:
"The problem might not even have a solution. But you aren't necessarily looking for solutions. You're maybe just looking for someone to say "sorry about how dead your fish are" or "wow, those are super dead. I still like you, though."
Amongst my prone to depression friends (of which I am one), "sorry your fish are dead" is excellent shorthand
https://hyperboleandahalf.blogspot.com/2013/05/depression-part-two.html