What can you infer from Hindley's actions toward Heathcliff in Catherine's diary entry?

She might think something is sort of akward be cau a e she notic the thing that was going on

You can infer that Hindley was jealous of Heathcliff when their father was alive. He did not treat Heathcliff well. Hindley started being worse when the father died. Catherine saw that Hindley did not accept Heathcliff as a brother because he tought Heathcliff took his father away from him. Because of that he was always ill treated by Hindley and then Heathcliff became revengeful.