ummmm? let's not forget the ml never told her he has siblings, especially four sisters. and if you reason "she could've asked", im pretty sure it's one of things you'd say randomly when you're getting to know eo/talking. soooo,,, by your comment, you're just toxic
Ngl I would just let her break up with me. Constantly being accused of lying would be so tiring that I would let them believe their delusions.