After 50 chapters, now I actually start wondering where the hell is her parents. Is it normal to not even come back to check on her for a whole year? And how is she not pregnant at this point, did she use pill?
At this chapter is already too late for him. The fact that he is so willing to accept her bad behavior, hug her because she is down, choose to go with her instead of his family originally, especially he is supposed to be neutral and nonchalant, means that he is interested in her romantically.
She does devalue herself but I don’t think in the way you think:
I think it's clear that Noa is very selfish. Her clingyness without a care of others feeling is what makes others leave her (friends/boyfriends). I think when she is unhappy about Rihito is nice to everyone, she is just envy that...