Should I tell my friend his abused ex is spiraling downward?
Why would you tell your friend that his ex is spiraling downward?
I'm unsupportive of her and her drug use.
You should try to stick to your own business because your friend's ex's life has nothing to do with yours. It would be best to let it go and forgot anything about their relationship.
I don't care and I think she's going down hill.
What she does is no one's concern but her own and her social circle now. Let others deal with her mess and try to focus on yourself and your own friends.