Isnt that unjustified resentment through misunderstanding.

Maru: You grew up with your grandmother, correct? That was your parents' decision. But your sister grew up with your parents. She received their love and attention. You felt shunned and unloved. As a result you felt lonely. You had no say in the matter. You had to go along with what they decided. This situation is similar. You're feeling unloved because Kyuu won't date you. But it's his decision or not he likes you and you're affected by that. 

Ageha: But..!

Maru: If you emphasize your feelings too much .. it could backfire you. Now put yourself in Kyuu's shoes. Would you go out with someone like you? Consider this.. 

Ageha,

"I do my thing, 

And you do your thing.

I am not in this world to live up your expectations,

And you are not in this world to live up to mine.

You are you,

And I am I,

And if by chance we find each other, it is beautiful.

If not, it can't be helped."

- The Gesalt Prayer by Fritz Perls. (A German psychotherapist)