"I... think I already have some idea," he answers awkwardly. "Before you said you didn't want me to see, I..."

He shifts a bit, reaching into his back pocket and pulling out the page, then holds it out to Johnny. "I read this." He pauses, then adds, "It was stuffed into my sock for some reason."

He's a bit nervous about upsetting Johnny again, now he seems to have calmed down. But it's probably better to tell him sooner rather than later, in case Johnny thinks he may have intentionally led him on.