Things that friends do:
Care. Or at least if they don't care, pretend to.
Tell you that your feelings are valid and that you're not crazy....even if they think you are.
I've had a particularly upsetting conversation in the past. I lost my wallet and I come home after being wet and uncomfortable to my large and empty bed. I just felt alone and isolated and unhappy. I've felt that feeling before and it's one I can deal with so, I figured I would go to sleep and wake up and feel better in the morning. Well a friend messaged me on facebook and after I told him what I was feeling and how I was feeling tied into more systematic issues in my life he completely dismissed me.
Me: I lost my wallet and the isolation that I feel relates to certain authority figures in my life always relating me to a negative state of being. The "darkness" that I feel right now is completely warranted because sometimes life is unfortunate and I wish that it weren't the case but I really do feel like this one instance is a symbol for other things that I'm trying not to let spill into various aspects of my life.
Him: I don't want to talk about it. G'night.
Okay. Great. So I'm crazy. Cool.