I had been friends with X for about 12 years.  I met her through a family member (Y).  She’s always been a demanding, manipulative sort. Back then I tolerated it because although she was hard work she was still a good friend. About 2-3 years after I met her she got chronically ill.  She used the illness as leverage for getting her own way even more often.  Still, I didn’t mind so much. 
Over the years we made mutual friends, and Y met a lady (Z) and married her.  As things progressed, X would frequently hang out with mutual friends/Y&amp;Z without inviting me.  Fine – sometimes you want to see people alone, but this was happening more and more often. She even started seeing my nephew who was only 15 at the time.  I started to do the same, because X and the others were always busy doing things at weekends, and so I had to meet other people or sit at home alone.  X told me that it upset her and made her cry that I was seeing friends without her, even though she had been doing the same thing to me for much longer. 
I should point out that I am also chronically ill, mentally.  I’ve had depression/OCD from the age of 8, and used to have bad anxiety (which now only comes in waves when my serotonin levels are low).  At first a lot of the mutual friends either didn’t know or thought it was much less serious than it is, but I am very open about it nowadays and most people know.
Me and X grew further and further apart.  Not too long ago we attempted reconciliation. I told her how I felt I was being shut out, and how it reminded me of when I was bullied throughout school.  She told me that she was upset that I didn’t seem to care enough about her illness.  I made it clear that it was painful for me to see her getting close to Y and Z without me.  I had found out later that on previous occasions when they had met up that and suggested inviting me along,  X had said ‘she’s busy on that day’ or ‘she wouldn’t like that’.  Never was I even asked.  I also found out that X had lied about cancelling a night out with me under the pretence of having to work, but she went out with Z instead.  It was only when Z posted on Facebook that I found out.  X said work had been cancelled.  Later, Z told me (inadvertently) there had never been work – X just wanted to go out with Z instead.  I know that X has lied to others about such things because I’ve witnessed it.
Things are going on as before.  X is still meeting up with my friends and family and never asked me, even though she has promised she would least sometimes.  It happened this weekend and it was just too much.  I now don’t want anything to do with her.  I’ll be polite when we cross paths but I have no interest in being a friend any longer. X has managed to convince everyone that she is the ‘victim’ here because she is ill and needs special treatment, and I’m the bad guy for not giving it to her.  Some people even tell me that I’m over-reacting because of my mental issues.  It’s painful and isolating.

