Why is Nelly dean jealous of Catherine?

Nelly Dean is not necessarily jealous of Catherine, but she does exhibit a complex mix of emotions towards her. Nelly serves as a caretaker and observer of the Earnshaw and Linton families, and she often expresses frustration at Catherine's choices, particularly her passionate love for Heathcliff and her eventual marriage to Edgar Linton. This frustration can be interpreted as envy of Catherine's emotional freedom and intensity of feelings, which contrasts with Nelly's more restrained and practical demeanor. Ultimately, Nelly's feelings reflect her position as a mediator in the tumultuous relationships surrounding her rather than outright jealousy.