Who told her?
Merope has just told Morfin that she knows about his relationship with their Muggle neighbour, Tom. Morfin has invited Tom over to discuss this.
Tom beamed, "Good afternoon, Morf."
Morfin frowned. "I wouldn't call it good exactly."
Tom asked, "What's wrong?"
Morfin told him, "Merope knows."
Tom inquired, "About us?"
Morfin nodded.
Tom queried, "Who told her?"
Morfin assured him, "Definitely not me."
Tom smiled slightly. "I never even suspected you, Morf."
Morfin said, "I want to know who told her just as much as you do."
Tom suggested, "Maybe she has a magical friend who told her."
Morfin smirked. "My sister is a Squib, remember?"
Tom raised an eyebrow and stated, "Don't think that I don't see her go to her 'special' private school."
Morfin gasped. "Y-You mean she's actually going to a magic school?"
Tom nodded and replied, "I think that it's Ilvermorny School of Witchcraft and Wizardry."
Morfin chuckled. "You, my dear Muggle, are at least ten times smarter than me and I don't even despise you one little bit for it." He added with a smile, "I love you."
Tom grinned. "I love you too."