My oldest friend (I've written about her on here before) has been very challenging for a year or more. Undergoing therapy, and I have given hours, days, so much time over to her listening to her problems, and everything being me, me, me. Constantly rejecting advice from not just me - I realise this is her prerogative, but why ask for help if you are not going to do anything? I saw her two or three times a week with me doing all the contacting all the time. I began to realise there was no reciprocity.
She has no other "real" friends, only people on Facebook she never meets or sees. She's been making very questionable contacts on FB, all men, all ending in tears (hers).
She never gets in touch. Ever. Last year I went on holiday for two weeks and when I had heard nothing I decided to have a "mini break" from her. Until she threatened to kill herself and I called round - said she was just having a meltdown and then said "Oh I should have perhaps called you". When I said yes, that would have been nice, she said "Oh I've always been like that. I never call people."
A month ago she was again going on about crying all the time and talking non stop about these strange contacts on Facebook. I just decided I was getting nothing from this friendship. I haven't contacted her since, and have heard absolutely zero from her either.
When I think of the times I spent an hour a day on the phone with her or round at her house, and she hasn't even realised she hasn't seen or heard from me for a month, or doesn't even care!
I actually think she has no understanding of what a friendship is about.