He had resolved from the first to tell her two things—that he was not chaste as she was, and that he was not a believer.
There are no more uses of "chaste" in the book.
Show samples from other sources
My parents divorced when I was twelve, and I think maybe, when I was very young, I witnessed a chaste cheek kiss between the two when it was impossible to avoid.
Gillian Flynn -- Gone Girl
Before he could answer, she stretched up to kiss him—a chaste press of lips to lips at first, but it deepened quickly, and soon he was parting her lips with his, tongue stroking into her mouth, and she could taste him: the sweetness of Jace spiked with the bite of champagne.