"I've always known that he's been putting on an act. That he can see through the bullshit, and he's not willing to participate in it."

This quote suggests that the speaker perceives someone as pretending or pretending to be something they're not. They believe this person is aware of dishonesty or insincerity around them and chooses not to engage with it. It highlights a sense of authenticity and awareness on their part. The overall context indicates that the individual is genuine and discerning, not easily fooled by appearances or false pretenses. It emphasizes the importance of honesty and staying true to oneself, even when social situations may tempt otherwise. The quote is from the book Isla and the Happily Ever After by Stephanie Perkins, which often explores themes of authenticity and self-awareness in relationships.