pls help

So basically I have this friend I've known for maybe 5 years. and shes been apart of my friend group throughout these years. I recently found out that she hates me. I love being her friend. BUT APPARENTLY, im "too honest" and "really mean". I've never done anything wrong besides call out her toxic relationship with her ex. He aint the best person but she has the biggest crush on him again. I told her how I felt about that kind of relationship and she completely ghosted me. But now we're in the same class and I have to see her everyday. im not supposed to know she hates me even tho she made it very obvious but I have to pretend to be her friend. what should i do