My sister basically just admitted she doesn’t love our mother

I know she is 100% entitled to her own feelings but I don’t know I feel so heartbroken over this. An inkling of me kind of knew and so did my mom, but I always reassured her that she does, because what mother wants to know that.. And now I know the truth and I just feel sick. This doesn’t change the way I see my sister but I’m just at a loss for words. I’m very close to mom and sister so I have always seen both of their perspectives on stuff..

They didn’t always see eye to eye, which has probably in return made my sister resent her, which to an extent I understand but the majority of their disagreements is my sister’s choice in S/O.

He’s a horrible man, abusive mentally, physically, possibly in-the closet (not that anything is wrong with that but unfair to my sister) and has said terrible, racist, things to my whole family including my mom. He has even said that he can’t wait til my mom passes away (she’s very sick) so he can quote throw a huge party with the money my sister will inherit.. My sister is delusional, and always took my mom’s hatred for him as an attack on herself.

I don’t know, I feel like I literally have no one to talk about this kind of stuff because I just feel like no one could ever understand :/