Friendship is hard

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I have this friend. I met her at work about five years ago. She’s been with me through some serious shit, but being her friend is difficult, to put it mildly. She tells me that she needs a friend, we make plans, and then she cancels. This has happened more than once.
There is no “typical” when it comes to depression, but I would hazard a guess that her case would pretty much be  textbook. She’s manic with social anxiety, and that, if you’ve never been around it, is a stressful person to be around. She also has a tendency to laugh maniacally while saying that she’s not depressed. It’s quite obvious to those around her, yet she continually denies it.
I’ve tried to be there for her, but I have my own struggles with depression, and I am an emotional empath. I tend to take on other’s pain and mirror them. This is great for them, because they feel like I really understand them. Not so great for me, because not only do I understand them, but I also have to find a way to claw myself up from their abyss.
I don’t have a friend like me. I tend to be drawn to those who are damaged, and damaged people are usually very self involved. I don’t mind being there for the people I love, but sometimes I would like to have a conversation that is not one sided. Sometimes, I would like a friend to ask how I’ve been, and call me on my bullshit when I say, “Fine”. One day, I’d like to be able to listen to a friend’s problems, and when it’s my turn, they pay attention and not just stare blankly until it’s their turn to talk again. I don’t think that’s asking for too much.