I'm going to cut off my depressed friend
Don't you think that's too much? Why would you cut her off?
I'm sick of seeing her. I've been seeing her for years and the whole situation is eating me up.
It sounds like your friend really needs someone to support her during these difficult times.  It can be hard for you as well, but it is wrong for you to let them down when they are in need.  Maybe you could find someone who can support you in turn.
She's just using me for my money and sympathy. I'm mad that she always cries and mostly does her whining at my place. She can support me by leaving me alone.
I feel like you're really not being a friend if you think she only needs your money and sympathy. As you have said, she's depressed and she need more understanding and care right now, and you don't have to be with her all the time, but you need to support her as there may not be that much people caring for her and she can't afford losing more.