The worst thing is that, although it's fucked how the FL's first love essentially abandoned her once she died and even spread the rumors that she was a witch.
However it was a messy situation being that, the first love truly did love her sister and would do anything for her even kill wisteria. The parents again hid the truth to protect the daughter that was theirs biologically and (presumably) alive.
So it's not a good or bad sitaution but rather a dark grey one which I do believe the FL needs to meet with her first love and her sister.
Because despite everything, her sister is the one who geuinely loved Wis and even in death goes out of her way to remember her.
rahhh this series is so ... melancholic - hopefully the FL will have a happy ending IF NOT I WILL LITERALLLLYYYY RAISE FIRESSSSSS SHE CAN NOT SUFFER MOREEEE