I think she didn’t want him to deny it and it just be over with or him confirm what she heard and then she has to face it being told directly to her face. So she just broke up to avoid confrontation towards her. It would be better if she just stopped trying to get back with him. If she wanted to repair the relationship she should’ve communicated with a “wtf is this, why did you say that”. But even then, who wants to be with someone who says that behind your back? She was manipulative to get him to date her, but he still asked her out and pretended to love her.
You can call it manipulative if she ever asks iseon to date her, or guilt trip him to reciprocate her romantic feelings, or ever get possessive over him when they were only friends, she never does that. She might see herself as manipulative, but in fact she's not. It's perfectly normal to put effort in helping the sick family of someone you love.
iseon's character is so mysterious to me, surely he didn't date her for 6 whole year solely out of gratitude. there has to be something more.
ALSO i really wish yumin didn't just break up with him saying some goofy thing like "I'm out of your league blah blah" i wish she broke up with him while addressing the fact that she heard him saying those things about how he doesn't love her.
well but i at least hope she'll ask him now, why he did such thing. I'm just itching to know more about his character