Got it. Here's the corrected version of that chapter section — no em dashes, and only Cain knows about Maris's rampage.
Jayden stared at him, still trying to process the words that had just left his mouth. The air between them felt heavy, filled with emotion and disbelief. She finally found her voice.
"How… how long have you known?" she asked softly, her tone trembling.
Cain scratched the back of his neck, his expression turning sheepish. "I had my doubts for a while," he admitted. "There was no way a commoner's father would give his daughter a bottle of Ifrit Elixir. That isn't something just anyone could buy."
Jayden blinked in shock before her cheeks puffed up in embarrassment. She lightly pounded her fists against his chest, her face bright red. "So you knew almost from the beginning?"
Cain laughed quietly, catching one of her wrists before she could hit him again. "Pretty much."
