Because Dani dated him bc she was moved by "someone like/appreciate her and confessed to her". She fell in love with the gesture not the person per se. She likes Yeodan bc she appreciate him, she likes his company and was moved by his gesture when she was alone and in times of needs. She did not date him because she loves him. Reason why she isn't really invested in the relationship or in Yeodan in general. She likes him etc but she's not close enough to him to be comfortable to talk to him.
Basically is like you dated someone you appreciate the company but, you're not invested enough to be there in the relationship since to begin with you don't actually love that person to care for them. She loves "that he loves her" and she feels good in his company but she doesn't "love" him in a romantic way.
Ohhhh thanks for the detailed explanation :3
I don't understand her relationship with yeodan. She doesn't really hang out with him, they don't talk about their feelings, don't kiss or touch much besides holding hands. Just a weird dynamic