"I may have had a crush on Zac, but we are like brother and sister, so nothing would ever happen"

Vanessa Hudgens is expressing her feelings for Zac, but likewise acknowledging that absolutely nothing will ever occur between them. She is indicating that she has a crush on him, but their relationship is more like that of siblings. This might be since they have understood each other for a long period of time, or because they have a strong bond that surpasses a romantic relationship. It might likewise be since they are both in the show business and have an expert relationship. Whatever the reason, Vanessa is making it clear that she has sensations for Zac, but that absolutely nothing will ever come of it. This quote reveals that Vanessa is fully grown and considerate of their relationship, and that she values their friendship more than any potential romantic relationship.