Hugs to you ((lost)) you are far from alone here. The healing library (upper left of the screen) is chock full of great reading. I'm so sorry about what you're dealing with, it's just awful your friend behaved as she did. Often, it seems as if people think this is catching or they just don't know how to deal with it/what to say or do. Not excusing her behavior AT ALL, that's very cold on top of the misery you were already trying to navigate.
If you just got confirmation then you did just find out. It takes lots of folks a while to get actual evidence. There are lots of great threads in that forum so I hope you'll read there, especially if you did just confirm your suspicions.
Above all, take care of yourself during this stressful time. Drink plenty of (nonalcoholic) fluids, if you can't eat try ensure or smoothies, if you need help with getting rest or fighting depression see your doctor, and please continue to reach out for support whether here-or a friend (who knows how to act), or with a therapist (I LOVED my therapy-meant the world to me and I highly reccomend it). Try to think of just one nice thing to do for yourself each day and do it.
I will be wishing you well and I'm sure wiser people than me will be along shortly, ((lost)) so sorry you're dealing with this, and please remember you are not alone.
Eta:the wiser ones arrived before I got my long winded post up! When I started it there were no replies yet. See? Waaay not alone here lost, so so (tragically) far from alone."A pair of powerful spectacles has sometimes sufficed to cure a person in love." -Friedrich Nietzsche
i edit frequently because i have to