Really sucks. Sorry to hear this. But... ...you DID find out who your friends are and aren't, if there is a silver lining in this. I found out some childhood friends really weren't any friends of mine through the vehicle of a "band". And I'm glad, in the long-term that I found out. I haven't talked to those people since, and it's been about 10-11 years now. I haven't tried to contact them, and they haven't tried to contact me. It's over.
It's understandable to be both mad and hurt. I would not blame you. There are what I call, the "users", which are people that are cool with you as long as they need you, and having you around suits their needs. And if you don't suit their needs at any point, no matter the history, whatever you can bring to the table, if you're better bassist, the nature of a pre-existing relationship that predates music, etc, etc, etc... ...is of little, if not no discernable consequence to them. Time will tell, but if nobody in this band calls you up or inquires how you're doing (your health, etc...) in the future, my guess is that they'd fall into what I'd call the "users" category.
And why would you want to play music with anyone like that anyway? A rhetorical question, I suppose.