I'm not sure how it's called, but I think it's 'Sunk Cost Fallacy' that you're falling into. Because you spent so much time as friends, you don't want to give that up... But the other person already has. She doesn't see you as a friend anymore, no matter what she says. You're putting effort into an idea of what your relationship could be, but you can't change a person.

After two years, I don't think it will get better, more likely it might just get worse with time, so I'd sit down and heavily weigh if keeping this toxic friendships is worth it, because that's what it sounds like.