Sorry, this is going to be a bit of a moan really. I just need to get this off my chest.
I have a 'close' friend who has ongoing anxiety and depression, which she has treatment for but she is still up and down a lot of the time. When she is reasonably up she can be quite self-centred. She also seems to have no ability to say sorry so she'll forget to do something or cancel plans and there is never an apology.
When she is down, sometimes it's difficult at first to work out if she is just being self-centred or if she is actually really depressed. Then I try to be supportive and feel bad about not noticing more quickly that she was down, even though I know it's not my job to fix her and that I am not a mind reader. I know that she has suicidal thoughts sometimes, although I don't think she has ever planned to carry it through, and she also has few other friends, so when she is down I try to check in on her regularly and be a friendly listening ear.
I guess that i am a bit resentful of her because she is not a great friend to me even when she is having good days, and I'm tired of the amount of my headspace she takes up when she is down because I worry about her being ok. I want to be kind to her but I don't think if the situations were reversed she would be as kind to me. So my question is, when is it ok to step away from a friend with depression?