I'm only posting here to see what other people think of this situation that I have been in.
An ex friend who decided to cut me off in February often always came across as wanting to always be centre of attention. For example if me or one of our mutual friends had something going on she only really seemed to give support when there was an audience around and by support it was like she had to I don't know... Out support anyone else? One example being a mutual friend had a health crisis just before Christmas and ended up in hospital over Christmas, when she went to A and E the ex friend was there but the entire time the friend was in hospital she didn't visit once and she barely even contacted her too. Also when my sister passed away she seemed to treat the funeral as a way to introduce herself to everyone who would listen to her.
Any time any of us would pull her up on her behaviour she'd then start involving her 13 year old daughter by trying to get us to talk through the daughter rather than directly to her. The last big fallout was an example of this situation. She had arranged herself to meet up with our mutual friend (mutual was still early in recovery here) and ended up pretty much standing her up. When questioned she claimed to have overslept (this is a frequent response when she fails to show up) and demanded we ask her daughter for back up. I received a voice message from her having her daughter backing her up and the poor kid sounded so put on the spot and on the verge of tears.
This resulted in the ex friend ultimately cutting us off as we did not want to involve her daughter as we felt it was unfair on her. Since then we have found we are able to relax more when meeting up as we are not frequently put upon her put downs of our interests or seemingly competitiveness for attention.